Mine has something like that too, I wondered what that was for.
Speaking of gas prices, we have a supermarket here called Winn-Dixie. When you shop there and use their card you save money on gas at shell stations. You can save up to 1.00 per gallon depending on how much you spend. A few weeks ago I filled up and got .50 cents off each gallon, and the last time it was .85 cents off! Not bad. So far I’m only up to .30 cents but when I have to fill up next week I should be close to .85 again, makes a big difference.