new trucks sales and an increase in new and used truck gross margin, coupled with an 18.0% increase in same-store service and parts gross profit.
On April 13, 2021, the company announced that it had completed its acquisition of Kansas City Freightliner (“KCFL”), which is expected to add approximately $450 million in annualized revenue. PTG now operates 35 locations throughout the U.S. and Canada which provide services such as new and used truck sales, parts and service, and collision repair.
Penske Transportation Solutions Investment
Penske Transportation Solutions (“PTS”) is a leading provider of full-service truck leasing, truck rental, contract maintenance, and logistics services. Penske Automotive Group has a 28.9% ownership interest in PTS and accounts for its ownership interest using the equity method of accounting. For the three and six months ended June 30, 2021, the company recorded $102.5 million and $156.2 million in earnings compared to $29.9 million and $43.5 million for the same period last year. The increase was principally driven by a strong North American Class 8 truck market and increased demand for the company’s full-service leasing, rental, and logistics services, coupled with improved efficiency and a reduction in operating expenses which drove a 15.4% return on sales for PTS during the second quarter 2021.
Corporate Development and Liquidity
As mentioned above, we acquired “KCFL” in April 2021, which we expect to add $450 million in annualized revenue. In addition, in June 2021, we acquired Mercedes-Benz of South Charlotte, which is expected to add $150 million in annualized revenues. We are also constructing an Audi dealership in Southern California and a Honda dealership in Texas, both of which are expected to open either in late 2021 or early in 2022 and collectively generate approximately $100 million in annualized revenue.
During the second quarter, we opened one CarShop Used Vehicle SuperCenter in the U.S. and one CarShop Used Vehicle SuperCenter in the U.K. We also expect to open an additional four locations by the end of 2021. We are targeting 40 locations, 150,000 in unit sales, and $100 million of earnings before taxes in the CarShop Used Vehicle SuperCenter operations by the end of 2023.
During the second quarter of 2021, we issued $500 million in aggregate principal amount of 3.75% senior subordinated notes due 2029, the proceeds of which were used to redeem our $500 million in aggregate principal amount of 5.50% senior subordinated notes due 2026 on June 24, 2021. The redemption resulted in $12.6 million in debt redemption costs noted above.
As of June 30, 2021, the company had available liquidity under its various credit agreements of approximately $1.1 billion.
Dividend and Share Repurchases
On July 21, 2021, we announced an increase in the quarterly dividend to $0.45 per share payable on September 1, 2021, to shareholders of record as of August 10, 2021.
During the six months ended June 30, 2021, we repurchased 495,307 shares of our outstanding common stock for $40.9 million, or an average of $82.63 per share. At the end of the second quarter, we had $142.5 million available under our securities repurchase program approved by our Board of Directors. In July 2021, our Board of Directors increased the share repurchase authority to $250 million.