OG&A expenses, as a percentage of sales, were 15.67% in the first two quarters of 2022 and 17.15% in the first two quarters of 2021. The decrease in the first two quarters of 2022, compared to the first two quarters of 2021, resulted primarily from the effect of sales leverage across fuel and supermarkets, which decreases our OG&A rate, as a percentage of sales, lower contributions to multi-employer pension plans, the 2021 OG&A Adjusted Items and broad-based improvement from cost savings initiatives that drive administrative efficiencies, store productivity and sourcing cost reductions, partially offset by investments in our associates, strategic investments in various margin expansion initiatives that will drive future growth and the 2022 OG&A Adjusted Item.
Our fuel sales lower our OG&A rate, as a percentage of sales, due to the very low OG&A rate, as a percentage of sales, of fuel sales compared to non-fuel sales. Excluding the effect of fuel, the 2022 Second Quarter OG&A Adjusted Item and the 2021 Second Quarter OG&A Adjusted Items, our OG&A rate increased 36 basis points in the second quarter of 2022, compared to the second quarter of 2021. This increase resulted primarily from investments in our associates, increased incentive plan costs and strategic investments in various margin expansion initiatives that will drive future growth, partially offset by the effect of supermarket sales leverage, which decreases our OG&A rate, as a percentage of sales, and broad-based improvement from cost savings initiatives that drive administrative efficiencies, store productivity and sourcing cost reductions.
Excluding the effect of fuel, the 2022 OG&A Adjusted Item and the 2021 OG&A Adjusted Items, our OG&A rate decreased 10 basis points in the first two quarters of 2022, compared to the first two quarters of 2021. This decrease resulted primarily from the effect of supermarket sales leverage, which decreases our OG&A rate, as a percentage of sales, lower contributions to multi-employer pension plans and broad-based improvement from cost savings initiatives that drive administrative efficiencies, store productivity and sourcing cost reductions, partially offset by investments in our associates and strategic investments in various margin expansion initiatives that will drive future growth.
Rent Expense
Rent expense decreased, as a percentage of sales, for the second quarter of 2022, compared to the second quarter of 2021, primarily due to sales leverage. Rent expense decreased in total and as a percentage of sales for the first two quarters of 2022, compared to the first two quarters of 2021. This decrease was primarily due to sales leverage and the completion of a property transaction during the first quarter of 2021 related to 28 previously leased properties that we are now accounting for as owned locations and therefore recognizing depreciation and amortization expense over their useful life.
Depreciation and Amortization Expense
Depreciation and amortization expense decreased, as a percentage of sales, in the second quarter and first two quarters of 2022, compared to the same periods in 2021, primarily due to sales leverage.
Operating Profit and FIFO Operating Profit
Operating profit was $954 million, or 2.8% of sales, for the second quarter of 2022, compared to $839 million, or 2.7% of sales, for the second quarter of 2021. Operating profit, as a percentage of sales, increased 11 basis points in the second quarter of 2022, compared to the second quarter of 2021, due to decreased OG&A expense, as a percentage of sales, partially offset by an increased LIFO charge and a lower FIFO gross margin rate. Fuel earnings also contributed to our operating profit growth for the second quarter of 2022, compared to the second quarter of 2021.
Operating profit was $2.5 billion, or 3.1% of sales, for the first two quarters of 2022, compared to $1.6 billion, or 2.3% of sales, for the first two quarters of 2021. Operating profit, as a percentage of sales, increased 85 basis points in the first two quarters of 2022, compared to the first two quarters of 2021, due to decreased OG&A expense, as a percentage of sales, partially offset by an increased LIFO charge and a lower FIFO gross margin rate. Fuel earnings also contributed to our operating profit growth for the first two quarters of 2022, compared to the first two quarters of 2021.