Exhibit 10.31

                          Casey's General Stores, Inc.
      Non-Qualified Supplemental Executive Retirement Plan Trust Agreement


         This Trust  Agreement is made as of this 24th day of October,  1997, by
and between Casey's General Stores,  Inc., an Iowa  corporation (the "Company"),
and UMB Bank,  n.a.  (the  "Trustee").  This Trust  Agreement  provides  for the
establishment  of a trust  to be  known  as the  Casey's  General  Stores,  Inc.
Non-Qualified  Supplemental  Executive  Retirement  Plan Trust (the  "Trust") to
provide a source for  payments  required  to be made under the  Casey's  General
Stores, Inc.  Non-Qualified  Supplemental Executive Retirement Plan (the "Plan")
for the benefit of certain of the  Company's  senior  executive  officers  named
therein (the "Participants") and their spouses.

                                   WITNESSETH:

         WHEREAS,  the Company will  transfer to the Trustee  certain  assets in
trust,  subject to the  claims of the  Company's  creditors  in the event of the
Company's  insolvency or  bankruptcy,  until paid to the  Participants  or their
spouses upon the terms and conditions stated in this Trust Agreement; and

         WHEREAS,  it is the intention of the Company to make  contributions  in
addition to the Initial  Contribution  (as defined in Section  1(a) below) (such
additional   contributions   are   referred   to  herein   as  the   "Additional
Contributions"  and,  together  with the Initial  Contribution,  are referred to
collectively as the  "Contributions")  to the Trustee upon or in anticipation of
the  occurrence of a Change of Control (as defined in Section 3(a) below) of the
Company.

         NOW,  THEREFORE,  the parties hereto do hereby  establish the Trust and
agree that the Trust shall be comprised,  held,  administered and disposed of as
follows:

         Section 1.  TRUST FUND

         (a)  Subject to the claims of its  creditors  as set forth in Section 5
hereof,  the  Company  hereby  deposits  with the  Trustee in trust One  Hundred
Dollars  ($100.00) (the "Initial  Contribution")  which shall become the initial
principal of the Trust to be held,  administered  and disposed of by the Trustee
as provided in this Trust  Agreement.  The Trustee  shall have no  obligation to
invest the Initial Contribution in an interest-bearing account.

         (b)      The Trust is intended to be a grantor trust, within the 
meaning of Section






671 of the Internal Revenue Code of 1986, as amended (the "Code"),  and shall be
construed accordingly.  The purpose of the Trust is to assure that the Company's
obligations to the Participants pursuant to the Plan are fulfilled. The Trust is
not intended to qualify under Section 401(a) of the Code.

         (c)  The  principal  of  the  Trust  and  any  earnings  thereon  (such
principal,  together  with any  earnings  thereon and other  increases  thereof,
reduced by any losses and distributions  from the Trust and any other reductions
thereof,  is sometimes  referred to herein as the "Trust  Assets") shall be held
separate and apart from other funds of the Company and shall be used exclusively
for the uses and purposes herein set forth. The Participants  shall not have any
preferred  claim on, or any beneficial  ownership  interest in, any of the Trust
Assets  prior to the time any of the Trust  Assets are paid to the  Participants
pursuant to the terms of this Trust Agreement,  and all rights created under the
Plan and this Trust Agreement shall be mere unsecured  contractual rights of the
Participants against the Company.

         (d) Except as provided in the second succeeding  sentence,  the Trustee
shall  have  full  discretion  in and sole  responsibility  for the  investment,
management and control of the Trust Assets.  Without  limiting such  discretion,
the Company  requests,  but does not direct,  that the  Trustee,  based upon the
nature of this Trust, only make short-term investments with a stated maturity of
twelve (12) months or less from the date of purchase by the  Trustee.  The Trust
Assets  shall only be invested in  obligations  of or  guaranteed  by the United
States of America, in commercial paper obligations  receiving the highest rating
from either Moody's Investors Service, Inc. or Standard & Poor's Rating Group or
a  similar  rating  service  or in  certificates  of  deposit,  bank  repurchase
agreements or bankers acceptances (including those of the Trustee) of commercial
banks with  capital  exceeding  $1,000,000,000  the  securities  of which or the
securities of the holding company of which are rated in the highest  category by
a   nationally-recognized   credit  agency   ("Permitted   Investments")  or  in
money-market funds which are invested solely in Permitted Investments.

         (e) The advisor to the Trust (the "Consulting Firm") shall be such firm
of independent public accountants or consulting actuaries of recognized national
standing  as the  Trustee  shall  select  following  a Change  of  Control  or a
Potential  Change of Control (each as defined  herein).  It is not intended that
the Consulting Firm act in a fiduciary capacity under the Plan or the Trust.

         Section 2.   CONTRIBUTIONS

         (a) Except as provided  in Section  2(b)  hereof,  the Company may make
such  Contributions  to the Trust as the Board of Directors of the Company deems
appropriate from time to time.






         (b) As soon as practicable following a Change of Control (as defined in
Section 3(a) hereof),  the Consulting Firm shall calculate the maximum aggregate
amount due pursuant to the Plan (without  regard to the present  value  thereof)
(the aggregate of such amounts is hereinafter referred to as the "Maximum Amount
Payable").  The Consulting Firm shall promptly  furnish such  calculation to the
Company  and  the  Company  shall  have  the   obligation  to  make   Additional
Contributions  to the Trust,  and shall  make  Additional  Contributions  to the
Trust, within three (3) business days of the receipt of such calculation,  in an
amount equal to the excess (the "Excess"), if any, of the Maximum Amount Payable
over the then fair market value of the Trust Assets, or shall direct the Trustee
to draw down a Letter of Credit (as defined in Section  2(d) hereof) held by the
Trust in such  amount for such  purpose.  If at any time  following  a Change of
Control, a valuation of the Trust Assets occurs pursuant to this Trust Agreement
and it is  determined  by the  Consulting  Firm that an Excess shall exist,  the
Company shall  promptly  contribute  such amount to the Trust as is necessary to
eliminate  the Excess,  or the Trustee shall be authorized to draw down a Letter
of Credit held by the Trust in such amount.

         (c)  Anything   contained  in  Section  2(b)  hereof  to  the  contrary
notwithstanding,  in the event of a  Potential  Change of Control (as defined in
Section 3(b) hereof),  the Company shall have the obligation to make  Additional
Contributions  to the Trust in an amount  equal to the  Excess,  or the  Trustee
shall be  authorized  to draw down a Letter of Credit  held by the Trust in such
amount.  If a Change of Control shall not have occurred  within ninety (90) days
of a Contribution  made pursuant to this Section 2(c) and the Board of Directors
adopts a resolution to the effect that, for purposes of this Trust Agreement,  a
Change of Control is not imminent, any amounts contributed to the Trust pursuant
to this Section 2(c), together with any earnings thereon, shall be promptly paid
by the Trustee to the Company.

         (d) The Company shall make all required  Contributions  to the Trust in
cash  or,  alternatively,  may  provide  the  Trustee  with an  irrevocable  and
unconditional  letter of credit  (the  "Letter of  Credit")  sufficient  for the
Trustee to draw down an amount  equal to all required  Contributions.  If at any
time the Trust has been  provided  with a Letter of Credit by the  Company,  the
Consulting  Firm will direct the Trustee (i) when to draw down on such Letter of
Credit and in what amount and (ii) whether, if necessary, to renew the Letter of
Credit or change its amount or terms. All  Contributions so received  (including
any cash  received  on the draw down of a Letter of Credit),  together  with the
income  therefrom  and  any  increment  thereon,  shall  be  held,  managed  and
administered by the Trustee as a single  commingled  Trust pursuant to the terms
of this Trust  Agreement  without  distinction  between  principal  and  income.
Neither the Trustee nor the  Consulting  Firm shall have any duty to require any
Contributions to be made to the Trustee by the Company or to determine whether a
Change of Control or Potential Change of Control has occurred.







         (e) Anything in Section 2 hereof to the contrary  notwithstanding,  the
Trustee  shall return to the Company as soon as feasible  following the close of
each calendar quar ter within each calendar year the excess,  if any, of (i) the
then aggregate fair market value of the Trust Assets over (ii) one hundred fifty
percent  (150%) of the Maximum Amount  Payable,  as determined by the Consulting
Firm at the request of the Company.

         (f) The  Company  may at any time or from time to time make  Additional
Contributions to the Trustee, which shall be held,  administered and disposed of
by Trustee as provided in this Trust Agreement.

         Section 3.   CHANGE OF CONTROL

         (a)      For purposes of this Trust Agreement, a "Change of Control" 
shall mean:

                  (i)  The  acquisition  (other  than  from  the  Company  in  a
transaction  approved by the  Incumbent  Board (as  defined in Section  3(a)(ii)
below)) by any person,  entity or "group" within the meaning of Section 13(d)(3)
or  14(d)(2)  of the  Securities  Exchange  Act of  1934  (the  "Exchange  Act")
(excluding,  for this purpose, the Company or its subsidiaries,  or any employee
benefit  plan of the  Company  or its  subsidiaries  which  acquires  beneficial
ownership of voting securities of the Company with the approval of a majority of
the Incumbent Board) of beneficial  ownership  (within the meaning of Rule 13d-3
promulgated  under the Exchange  Act) of twenty  percent (20%) or more of either
the then  outstanding  shares of the Company's  Common Stock,  no par value (the
"Common Stock") or the combined  voting power of the Company's then  outstanding
voting  securities in a transaction or series of transactions  not approved by a
vote of at least a majority of the Incumbent Board (as defined below); or

                  (ii) The failure of  individuals  who, as of the date  hereof,
constitute the Board of Directors of the Company (the "Incumbent Board") for any
reason  to  constitute  at least a  majority  of the Board of  Directors  of the
Company,  provided  that any person  becoming a director  subsequent to the date
hereof whose election, or nomination for election by the Company's shareholders,
was approved by a vote of at least a majority of the  directors  comprising  the
Incumbent  Board (other than an election or nomination  of an  individual  whose
initial  assumption  of office  is in  connection  with an actual or  threatened
election  contest  relating to the election of the directors of the Company,  as
such  terms are used in Rule  14a-11 of  Regulation  14A  promulgated  under the
Exchange  Act) shall be, for  purposes of this Trust  Agreement,  considered  as
though such person were a member of the Incumbent Board; or

                  (iii) The  approval  by the  stockholders  of the Company of a
reorganization, merger or consolidation (in each case, with respect to which the
stockholders of the Company do not, immediately thereafter,  own more than fifty
percent






(50%) of the combined  voting power of the  reorganized,  merged or consolidated
company's then outstanding voting  securities),  of a liquidation or dissolution
of the Company or of the sale of all or  substantially  all of the assets of the
Company.

         (b) For  purposes  of this  Trust  Agreement,  a  "Potential  Change of
Control"  shall be deemed to have  occurred if (i) any third person  commences a
tender or  exchange  offer  (other  than a tender or exchange  offer  which,  if
consummated,  would not result in a Change of Control) for twenty  percent (20%)
or more of the then outstanding  shares of Common Stock or combined voting power
of the Company's then  outstanding  voting  securities;  (ii) the Company enters
into an agreement, the consummation of which would result in the occurrence of a
Change of Control;  (iii) any person (including the Company) publicly  announces
an intention to take or to consider  taking actions which if  consummated  would
constitute  a Change of Control;  or (iv) the Board of  Directors of the Company
adopts a resolution to the effect that, for purposes of this Trust Agreement,  a
Change of Control is imminent.

         (c) The  Company  shall  have a duty to inform the  Trustee  whenever a
Change of  Control  or  Potential  Change of Control  has  occurred.  If any two
Participants notify the Trustee in writing that a Change of Control or Potential
Change of Control  has  occurred  then,  unless,  in the  opinion of  nationally
recognized counsel to the Company (which opinion may be based on representations
of fact as long as counsel does not know that such  representations  are untrue)
such a Change of Control or  Potential  Change of Control  has not  occurred,  a
Change of Control or Potential Change of Control will be deemed to have occurred
for purposes of this Trust Agreement.

         Section 4.   ACCOUNTING BY THE TRUSTEE AND CONSULTING FIRM

         (a) The  Trustee  shall  keep  accurate  and  detailed  records  of all
investments,  receipts,  disbursements and all other transactions required to be
done, including such specific records as shall be agreed upon in writing between
the Company and the Trustee.  Within sixty (60) days following the close of each
calendar year and within sixty (60) days after the removal or resignation of the
Trustee,  the Trustee  shall  deliver to the Company and the  Consulting  Firm a
written  account of its  administration  of the Trust during such year or during
the period from the close of the last preceding year to the date of such removal
or resignation, setting forth all investments, receipts, disbursements and other
transactions  effected by it,  including a  description  of all  securities  and
investments  purchased and sold with the cost or net proceeds of such  purchases
or sales (accrued interest paid or receivable being shown  separately),  showing
all cash,  securities  and other  property  held in the Trust at the end of such
year or as of the date of such removal or  resignation,  as the case may be, and
the book and fair market value of any such asset. The Consulting Firm shall send
a copy of any written account to each Participant at the address provided by the
Company.






         (b) As soon  as  practicable  following  a  Change  of  Control  of the
Company,  the  Consulting  Firm shall (i)  establish  and  maintain a memorandum
account  for each  Participant  with  respect  to the Plan  (the  "Participant's
Account") and (ii)  calculate the amount which would be due to each  Participant
(or the Participant's spouse) upon satisfaction of the conditions under the Plan
which  give rise to the  obligation  of the  Company  to pay such  amount to the
Participant (or the Participant's spouse) (the "Plan Payments").  The Consulting
Firm shall credit each  Participant's  Account with the Plan  Payments and shall
debit the Participant's Account with any amounts paid to the Participant (or the
Participant's spouse) with respect to the Plan by the Company or the Trustee.

         (c) The Company  shall furnish the  Consulting  Firm with copies of the
Plan and any and all amendments  thereto.  The Company will promptly provide the
Consulting  Firm with a copy of any notice of  termination  given by the Company
with respect to any  Participant  and will also promptly  provide the Consulting
Firm with any and all  additional  information  the Consulting  Firm  reasonably
requests or the Company believes would be useful to the Consulting Firm in order
to enable the  Consulting  Firm to determine  the amount of Plan  Payments  with
respect to each  Participant  and to effect such Plan Payments and will promptly
update such information as it changes.  The Company will use its best efforts to
cause each  Participant to provide the Consulting Firm with all information that
it may reasonably request in order to determine the amount of Plan Payments with
respect to the Participant.  The Trustee shall notify the Consulting Firm of any
payment  made  from the Trust to the  Participant  or the  Participant's  spouse
pursuant to the terms of the Plan, in each case, so that the Consulting Firm may
debit the Participant's Account.

         (d) All accounts,  books and records  maintained  pursuant to Section 4
shall be open to inspection and audit at all reasonable times by the Company and
on an annual basis by the Participants;  provided,  however, that no Participant
shall have access to information about another  Participant's Account other than
in the normal course of performing his duties as an employee of the Company.

         (e) The fair market value of the Trust Assets  shall be  determined  by
the Trustee whenever required pursuant to this Trust Agreement, but in any event
not less than  quarterly.  The  Trustee  may base such  determination  upon such
sources of information as it may deem reliable,  including,  but not limited to,
information  reported in (i)  newspapers of general  circulation,  (ii) standard
financial periodicals or publications, (iii) statistical and valuation services,
(iv) the  records of  securities  exchanges  or  brokerage  firms  deemed by the
Trustee  to be  reliable  or (v) any  combination  thereof.  The  Trustee  shall
promptly inform the Consulting Firm of any such valuation.

         Section 5.  PAYMENTS TO THE PARTICIPANTS






         (a)  The  Trustee  shall  make  payments  to the  Participants  (or the
Participants'  spouses) from the Trust  Assets,  if and to the extent such Trust
Assets are available for distribution, in accordance with the provisions of this
Trust  Agreement,  provided  that the  Company is not  Insolvent  (as defined in
Section 6(a)) at the time any such payment is required to be made.

         (b) Subject to Section 5(a) hereof,  the Consulting Firm shall,  within
five (5)  business  days of the date a payment is  required to be made under the
Plan, notify and direct the Trustee to pay the Participant (or the Participant's
spouse) an amount  equal to the lesser of the amount so  required  to be paid or
the then credit balance in the Participant's Account; provided, however, that if
the aggregate of the then credit balances in the Participants'  Accounts exceeds
the then fair market value of the Trust Assets,  then the Consulting  Firm shall
direct the Trustee to pay to the Participant (or the  Participant's  spouse) the
lesser of the  amount  so  required  to be paid or such  portion  of the  credit
balance  in the  Participant's  Account  which is  equal to (a) the full  credit
balance  in the  Participant's  Account  multiplied  by (b) a  fraction  (i) the
numerator  of which is the then fair market  value of the Trust  Assets and (ii)
the  denominator  of which is the  aggregate of the then credit  balances in the
Participants' Accounts.

         (c) Whenever the Consulting Firm notifies the Trustee to make a payment
to a Participant  (or the  Participant's  spouse),  the Trustee shall supply the
Consulting  Firm with the current fair market  value of the Trust Assets  within
two (2) business  days so that the  Consulting  Firm may make the  determination
required hereunder.  The Trustee shall pay the Participant (or the Participant's
spouse) the amount set forth in the notice from the Consulting  Firm within five
(5) business days of receiving notice from the Consulting Firm.

         (d) For the purposes of this Trust Agreement, the Consulting Firm shall
determine,  pursuant  to the  terms  of the  Plan,  when a  Participant  (or the
Participant's spouse) is entitled to receive a payment thereunder and the amount
thereof.  The Trustee  shall be under no duty to make  inquiry as to whether the
determination  made by the  Consulting  Firm is correct or whether  any  payment
amount is proper and correct.

         (e) Anything in this Trust  Agreement to the contrary  notwithstanding,
all  payments  pursuant to this  Section 5 may be made  without the  approval or
direction of the Company, shall be made despite any direction to the contrary by
the Company and shall be made upon the direction of the Consulting Firm.

         (f) If the Trust Assets are not  sufficient to make all payments to the
Participants  required to be made pursuant to the terms of the Plan, the Company
shall pay to each  Participant the balance of each such payment as it falls due.
If such  payments  are not made by the  Company,  and the Trust  later  contains
sufficient Trust Assets to make






such payments,  they shall be made from the Trust Assets, together with interest
at the rate determined  pursuant to Section 1274(d) of the Code,  subject to the
requirements of Sections 5(a) and 5(b) hereof.

         Section 6.  TRUSTEE RESPONSIBILITY REGARDING PAYMENTS WHEN
COMPANY INSOLVENT

                  (a) The Company shall be considered  "Insolvent"  for purposes
of this Trust  Agreement  if (i) the  Company is unable to pay its debts as they
mature, or (ii) the Company is subject to a pending proceeding as a debtor under
the United States Bankruptcy Code or any similar law of any state.

                  (b) At all times  during the  continuance  of this Trust,  the
Trust Assets  shall be subject to claims of general  creditors of the Company as
hereinafter set forth, and at any time the Trustee has actual knowledge,  or has
determined,  that the  Company is  Insolvent,  the  Trustee  shall  deliver  any
undistributed  Trust  Assets to  satisfy  such  claims  as a court of  competent
jurisdiction may direct.  The Chief Executive  Officer of the Company shall have
the duty to inform the Trustee of the Company's Insolvency.  If the Company or a
person  claiming  to be a  creditor  of the  Company  alleges  in writing to the
Trustee that the Company has become Insolvent,  the Trustee shall  independently
determine,  within  thirty (30) days after  receipt of such notice,  whether the
Company  is  Insolvent  and,  pending  such  determination,  the  Trustee  shall
discontinue  payments to the  Participants,  shall hold the Trust Assets for the
potential  benefit of the Company's  general creditors and shall resume payments
to the  Participants  in accordance  with Section 5 of this Trust Agreement only
after the Trustee has  determined  that the Company is not  Insolvent  (or is no
longer  Insolvent,  if  the  Trustee  initially  determines  the  Company  to be
Insolvent).  If the Trustee,  after the  expiration of such thirty (30) days, in
good faith and with the advice of such  advisors as may be retained  pursuant to
Section 7 hereof, is unable to determine  whether the Company is Insolvent,  the
Trustee (i) shall so notify the Company and the Consulting  Firm in writing (and
the Consulting Firm shall promptly notify the Participants (or their spouses) at
the address supplied by the Company) and any of the Trustee,  the Company or the
Participants  (or any of the  Participants'  spouses)  may apply to any court of
competent  jurisdiction for a  determination,  for purposes of this Trust, as to
whether or not the Company is Insolvent,  and (ii) the Trustee  shall  thereupon
hold the Trust Assets pursuant to the terms of this Trust Agreement  pending the
determination  of such court.  Unless the Trustee  has actual  knowledge  of the
Company's  Insolvency,  the  Trustee  shall have no duty to inquire  whether the
Company  is  Insolvent.  The  Trustee  may in all events  rely on such  evidence
concerning  the  Company's  solvency as may be  furnished to the Trustee as will
give the Trustee a reasonable  basis for making a  determination  concerning the
Company's  solvency.  Nothing in this Trust  Agreement shall in any way diminish
any rights of a  Participant  (or a  Participant's  spouse) to pursue his or her
rights as a general creditor of the Company with respect to the Plan or






otherwise.

                  (c) If the Trustee discontinues payments from the Trust to any
Participant  (or  to a  Participant's  spouse)  pursuant  to  Section  6(b)  and
subsequently   resumes  such   payments,   the  first  payment   following  such
discontinuance  shall,  subject to Sections  5(a) and 5(b)  hereof,  include the
aggregate  amount of all payments which would have been made to the  Participant
(or to the Participant's spouse),  together with interest at the rate determined
pursuant to Section 1274 of the Code on the amount delayed, during the period of
such  discontinuance,  less  the  aggregate  amount  of  payments  made  to each
Participant  (or to the  Participant's  spouse)  by the  Company  in lieu of the
payments  provided for hereunder  during any such period of  discontinuance,  as
certified to the Trustee by the Consulting Firm.

         Section 7.   RESPONSIBILITY OF TRUSTEE AND THE CONSULTING FIRM

         (a) The Trustee shall act with the care, skill,  prudence and diligence
under the  circumstances  then prevailing that a prudent person acting in a like
capacity  and  familiar  with  such  matters  would  use  in the  conduct  of an
enterprise of a like character and with like aims; provided,  however,  that the
Trustee  shall incur no liability  to anyone for any action taken  pursuant to a
direction,  request or approval given by the Company, the Consulting Firm or any
Participant  contemplated  by  and  complying  with  the  terms  of  this  Trust
Agreement.  The Trustee shall discharge its  responsibility  for the investment,
management  and  control  of the  Trust  Assets  solely in the  interest  of the
Participants  (and the  Participants'  spouses) and for the exclusive purpose of
assuring  that, to the extent of available  Trust Assets,  all Plan Payments are
paid when due to the Participants (or to the Participants' spouses).

         (b) Neither the  Trustee nor the  Consulting  Firm shall be required to
undertake  or to defend any  litigation  arising in  connection  with this Trust
Agreement, unless it be first indemnified by the Company against its prospective
costs,  expenses and  liability,  and the Company hereby agrees to indemnify the
Trustee and the Consulting Firm for such costs, expenses and liability.

         (c) The Trustee and the Consulting  Firm may consult with legal counsel
(who may also be counsel for the Trustee or the Consulting  Firm generally) with
respect  to any of its  duties  or  obligations  hereunder  and  shall  be fully
protected in acting or refraining  from acting in accordance  with the advice of
such counsel.

         (d)      The Trustee may hire agents, accountants and financial 
consultants.

         (e)      The Trustee is authorized and empowered:







     (i) To purchase,  hold, sell,  invest and reinvest the assets of the Trust,
together with income therefrom;

     (ii) To hold, maintain and control all property at any time forming part of
the Trust Assets;

     (iii)  To  sell,  convey,  transfer,  exchange  and  otherwise
dispose  of the  Trust  Assets  from  time  to time in  such  manner,  for  such
consideration and upon such terms and conditions as it shall determine;

      (iv)     To make payments from the Trust as provided hereunder; and

      (v) To exercise all the further  rights,  powers,  options and
privileges  granted,   provided  for  or  vested  in  trustees  generally  under
applicable  Federal or State of Missouri  law, as amended from time to time,  it
being intended that, except as herein otherwise  provided,  the powers conferred
upon the Trustee  herein shall not be construed  as being in  limitation  of any
authority conferred by law, but shall be construed as in addition thereto.

      (f) The Trustee in any and all events is authorized and empowered to do
all other acts necessary or desirable for the proper administration of the Trust
Assets, as though the absolute owner thereof, including, but not limited to, the
authorization and power:

                  (i) To cause any of the Trust  Assets  to be  issued,  held or
registered  in the name of the  Trustee,  in the name of its  nominee or in such
form that title will pass by  delivery,  provided,  the  records of the  Trustee
shall indicate the true ownership of such property;

                  (ii)     To employ such agents and counsel as may be 
reasonably necessary in managing and protecting the Trust Assets and to pay 
them reasonable compensation; and

                  (iii) To settle, compromise or abandon with the consent of the
Company all claims and demands from other than the  Participants  or the Company
in favor of or against the Trust Assets.

         Section 8.  COMPENSATION AND EXPENSES OF TRUSTEE AND
CONSULTING FIRM

         The Trustee and the  Consulting  Firm shall each be entitled to receive
such reasonable  compensation  for their services as shall be agreed upon by the
Company and






the  Trustee or the  Consulting  Firm,  as the case may be. The  Trustee and the
Consulting Firm shall each also be entitled to receive their reasonable expenses
incurred with respect to the administration of the Trust, including counsel fees
and fees  incurred by the Trustee and the  Consulting  Firm pursuant to Sections
7(b),  7(c),  7(d) and 7(f) hereof.  Such  compensation  and  expenses  shall be
payable by the Company and if not so paid, shall be paid by the Trustee from the
Trust  Assets.  In the event any Trust Assets are used pursuant to the preceding
sentence to pay compensation and expenses to the Trustee or Consulting Firm, the
Company  shall  promptly  contribute to the Trust any such amount (or direct the
Trustee to draw down on a Letter of Credit held by the Trust in such amount).

         Section 9.  RESIGNATION AND REPLACEMENT OF TRUSTEE

         (a) The Trustee may resign at any time during the term of this Trust by
delivering  to the  Company  and the  Consulting  Firm a  written  notice of the
proposed  resignation.  The  Consulting  Firm  shall  deliver a copy of any such
notice to each Participant or his spouse at the address supplied by the Company.
Such resignation shall take effect upon the qualification of a successor Trustee
and such successor Trustee commencing to act as such.

         (b) In the  event  that,  prior to a Change  of  Control,  the  Trustee
notifies  the  Company  of its  intention  to  resign,  in  accordance  with the
foregoing  provisions  of this Section 9, the Company  shall appoint a successor
Trustee  which shall be a bank or trust  company.  The Trustee  shall  thereupon
deliver  to the  successor  Trustee  all the Trust  Assets,  together  with such
records and  documents  as may be  reasonably  required to enable the  successor
Trustee to properly administer the Trust,  reserving such funds as it reasonably
deems necessary to cover its unpaid bills, expenses and closing costs.

         (c) Upon  qualification of a successor  Trustee,  all right,  title and
interest  of the  resigning  Trustee  in the Trust  Assets  and all  rights  and
privileges  under  this Trust  Agreement  theretofore  vested in such  resigning
Trustee shall vest in the successor Trustee where applicable,  and thereupon all
future liability of said resigning Trustee shall terminate;  provided,  however,
that the Trustee  shall  execute,  acknowledge  and deliver  all  documents  and
written  instruments  which are  necessary  to assign,  transfer  and convey the
right,  title and interest in the Trust Assets and all rights and  privileges of
the Trustee to the successor Trustee.

         (d) Nothing in this Trust  Agreement  shall be interpreted as depriving
the  Trustee or the  Company of the right to have a judicial  settlement  of the
Trustee's  accounts,  and upon any proceeding  for a judicial  settlement of the
Trustee's  accounts or for instructions the only necessary  parties thereto will
be the Trustee and the Company.

         Section 10.  AMENDMENT OR TERMINATION






         (a) This Trust  Agreement  may be amended at any time prior to the time
any  Additional  Contribution  is  made  (or,  after  the  time  any  Additional
Contribution is made if such Additional  Contribution is returned to the Company
in accordance with Section 2(c) hereof) and to any extent (including  amendments
to add  other  agreements,  contracts  or  plans  between  the  Company  and the
Participants  or other key  employees) by a written  instrument  executed by the
Trustee and the Company.

         (b) This Trust shall be revocable by the Company  prior to the time any
Additional  Contribution  is made or required  to be made  pursuant to the terms
hereof and may be terminated  by the Company  prior thereto (or,  after the time
any Additional  Contribution is made if such Additional Contribution is returned
to the Company in accordance with Section 2(c) hereof).  After the occurrence of
a Change of Control,  the Trust shall  remain in effect until the receipt by the
Trustee of a certification  from the Consulting Firm that all liabilities  under
the Plan have been satisfied;  provided that, if any payment made from the Trust
or to be made pursuant to the Plan is being  contested or  litigated,  the Trust
shall remain in effect until such contest, litigation or dispute is resolved.

         (c) At the  termination  of the Trust  pursuant to Section  10(b),  the
Trustee shall as soon as  practicable,  but in any event within ninety (90) days
of the date of such termination,  transfer to the Company the value of the Trust
Assets as of the termination date.

         Section 11.  PROTECTION OF THE TRUSTEE AND THE CONSULTING
FIRM

         (a) The Company agrees,  to the extent  permitted by applicable law, to
indemnify  the Trustee and the  Consulting  Firm and hold them harmless from and
against any claim or  liability  that may be asserted  against them by reason of
their taking or  refraining  from taking any action under this Trust  Agreement,
including,  without limiting the generality of the foregoing,  any claim brought
against  the  Trustee  or the  Consulting  Firm  by the  Company,  in any  case,
otherwise  than  on  account  of the  Trustee's  or the  Consulting  Firm's  own
negligence or willful misconduct.

         (b)  The  Trustee   shall  be  fully   protected   in  relying  upon  a
certification of an authorized  representative  of the Company or the Consulting
Firm with  respect to any  instruction,  direction or approval of the Company or
the Consulting Firm until a subsequent certification is filed with the Trustee.

         (c) The Trustee and the Consulting  Firm shall each be fully  protected
in acting  upon any  instrument,  certificate  or paper  believed  by them to be
genuine  and to be signed or  presented  by the proper  person or  persons,  and
neither the Trustee nor the Consulting






Firm  shall be under any duty to make any  investigation  or  inquiry  as to any
statement  contained in any such  writing but may accept the same as  conclusive
evidence of the truth and accuracy of the statements therein contained.

         (d) The Trustee shall not be liable for the proper  application  of any
part of the Trust Assets if distributions  are made in accordance with the terms
of  this  Trust  Agreement  and  information  furnished  to the  Trustee  by the
Consulting  Firm. All persons dealing with the Trustee are released from inquiry
into the decision or authority of the Trustee and from seeing to the application
of any monies, securities or other property paid or delivered to the Trustee.

         Section 12.  COMMUNICATION

         (a)      Communications to the Company shall be addressed to the 
                  Company at:

                  Casey's General Stores, Inc.
                  P.O. Box 3001
                  One Convenience Blvd.
                  Ankeny, Iowa  50021

                  Attention: President

         (b)      Communications to the Trustee shall be addressed to it at:

                  UMB Bank, n.a.
                  1010 Grand Blvd.
                  P.O. Box 419692
                  Kansas City, Missouri 64141-6692

                  Attention: Employee Benefit Division

         Section 13.  SEVERABILITY AND ALIENATION

         (a) Any  provision of this Trust  Agreement  prohibited by law shall be
ineffective to the extent of any such prohibition without invalidating or in any
other way limiting the remaining provisions hereof.

         (b) The rights, benefits and payments of a Participant payable from the
Trust  Assets may not be  anticipated,  assigned  (either at law or in  equity),
alienated or subject to attachment,  garnishment, levy, execution or other legal
or equitable  process except as required by law. Any attempt by a Participant to
anticipate,  alienate,  assign, sell, transfer,  pledge,  encumber or charge the
same shall be void. The Trust Assets shall not in any






manner be subject to the debts, contracts, liabilities,  engagements or torts of
any Participant  and payments  hereunder shall not be considered an asset of the
Participant  (or of the  Participant's  spouse)  in the event of  insolvency  or
bankruptcy.

         Section 14.  GOVERNING LAW

         This Trust  Agreement  shall be governed by and construed in accordance
with the laws of the  State of  Missouri  without  reference  to  principles  of
conflicts of law.

         Section 15.  MISCELLANEOUS

         (a) The Trustee shall not be either  individually  or severally  liable
for any taxes of any kind levied or assessed  under the  existing or future laws
against the Trust Assets.  The Trustee  shall  withhold from each payment to any
Participant  or spouse any federal,  state or local  withholding  taxes which is
from time to time required to be deducted under  applicable laws, as directed by
the  Consulting  Firm.  To the extent that any taxes levied or assessed upon the
Trust are not paid by the Company,  the Trustee  shall pay such taxes out of the
Trust Assets.

         (b)  Expenses  and fees of the Company for the  administration  of this
Trust and services in relation  thereto for actuarial,  legal and accounting and
other similar expenses,  including any costs with respect to the creation of the
Trust,  shall be paid by the  Company  and,  if not so paid,  may be paid by the
Trustee from the Trust Assets.

         (c)  Participation  in this Trust  shall not give any  Participant  any
right to be retained  as an  employee  of the Company nor any rights  other than
those specifically enumerated herein or in the Plan.

         (d) Any payment to any Participant  (or to a  Participant's  spouse) in
accordance  with this Trust Agreement  shall, to the extent thereof,  be in full
satisfaction  of all claims  against the Trustee and the Company under the Plan.
Nothing in this Trust  Agreement  shall  relieve the Company of its liability to
pay  benefits  under the Plan  except to the  extent  such  liabilities  are met
through the use of the Trust Assets.

        (e)  Headings in this Trust  Agreement  are  inserted  for  convenience 
of reference  only  and  are  not  to be  considered  in  the  construction  
of the provisions hereof.

         (f) This Trust Agreement may be executed in several counterparts,  each
of which shall be deemed an original, and said counterparts shall constitute but
one and the same  instrument,  which may be  sufficiently  evidenced  by any one
counterpart.

         (g)      This Trust Agreement shall inure to the benefit of, and be 
binding upon, the






parties hereto and their successors and assigns.

         (h)      As used in this Trust Agreement, the masculine gender shall 
include the feminine and neuter genders.

         (i)  Any  action  of the  Company  pursuant  to this  Trust  Agreement,
including all orders, requests, data, directions, instructions and other related
information shall be in writing signed on behalf of the Company by an officer or
named designee of the Company.

         IN WITNESS  WHEREOF,  the Company and the Trustee  have  executed  this
Trust Agreement as of the date first above written.

                                    CASEY'S GENERAL STORES, INC.


                           By:      /s/ Ronald M. Lamb
                                    ------------------------------
                                    Name:   Ronald M. Lamb
                                    Title:  President and C.O.O.


                                    UMB BANK, n.a.


                            By:      /s/ Mark P. Herman
                                     ----------------------------------
                                     Name: Mark P. Herman
                                     Title:   Senior Vice President









                                  FEE AGREEMENT

The employer  acknowledges  that the fees for  Trustee/Custodial  services to be
performed  by UMB Bank,  n.a.  will be in  accordance  with the  Negotiated  Fee
Schedule listed below.
Fees may be billed to the employer or charged to the Trust.

ACCOUNT SET-UP FEE:                      $300

ANNUAL ADMINISTRATIVE FEE:               $350

TAX REPORTING FEE:                       $100/year

SECURITIES FEE:                          WAIVED (on initial $100 contribution)
                                         Future securities fees are WAIVED 
                                         until an additional contribution is 
                                         made to this account.

                  If a securities  fee is  implemented,  the following  schedule
                  will apply:

                  These are assessed quarterly on the ending market value of the
                  assets. The amounts specified are the annual percentages to be
                  charged.

                           a.       .65 of 1% on the first $500,000
                                    .45 of 1% on the next $2,000,000
                                    .35 of 1% on all over $2,500,000

                           b.       .20 of 1% on all assets invested in Scout, 
                                    Fidelity Advisor, American Century Advisor 
                                    and Federated Funds

SECURITIES TRANSACTION FEE:             There is a $15 charge for each directed 
                                        security transaction in excess of one 
                                        per quarter.   Transactions in the 
                                        Scout Funds are exempt from this charge.

BENEFIT PAYMENTS AND OTHER
EXPENSE DISBURSEMENTS:            $10/check

TERMINATION AND TRANSFER FEE:     Charged at hourly rates 
                                  (minimum fee of $300)

EXTRAORDINARY CHARGES:          Charged at hourly rates

HOURLY FEE:           Legal or Management          $100/hour






                      Other                        $  50/hour

The Fee Schedule referenced above is applicable to the account(s) listed below:

         Name of Plan:       Casey's General Stores, Inc. Supplemental Executive
                             Retirement Plan

         Account No.:        46-0080

                  --
                  --       The fee is to be Charged to the Trust.

                  --
                  X        The fee is to be Billed to the firm for payment.
                  --

October 24, 1997                   /s/ John G. Harmon
- ---------------------              ---------------------------
Date                               Casey's General Stores, Inc.

November 4, 1997                   /s/ Mark P. Herman, Senior Vice President
- -----------------------            -----------------------------------------
Date                               UMB Bank, n.a.