Gas prices

On my way home from Kzoo yesterday I stopped to buy some gas. I also wanted chocolate and pop, ya know, driving food. So i opted to pay inside so I could charge it all at once. So I fill up my car, walk inside and I hear the girl behind the counter speaking into the intercom " Sir - if you wait a minute to fill up your gas tank, I'm lowering the price 3 cents a gallon." I sorta signed and said "Oh man" and she just looked at me and was like "I'm sorry" They couldn't give the cheaper price, since when I put it in my tank, it cost 2.29.