Our (new) local grocery store Price Chopper has an on-going promo with Sunoco, $.10c a gallon off for every $10 you spend at the store. I wasn't really paying attention and spent $60 on light groceries. Later, using the reciept and the bonus card, I swiped it at the pump and wow, $6.70 off a 11g tank! Chasing around for a few cents off a gallon is a waste, but this is a serious discount. I wish I knew about it when I buying a few tanks a week.