Gas Prices

Am I the only one who doesn't understand how gas prices are set?

Last night I drove by my local QT and the price of gas was $2.19. This morning I go by and it is now $2.25 but they haven't had a fuel delivery of any type. So the gas I would have put in my car last night cost them the same as the gas I would have put it in this morning but it is costing me .06 extra a gallon.