the stations have already paid for the truckload they have stockpiled. the lower prices won't reflect right away because, simply, you're not going to sell expensive product cheaper as a public service. take my company, for example... why does red lobster not do all- you- can eat shrimp year round?
a. limited time= increased interest
and
b. when you get it cheaper, you sell it cheaper.
you sell cheap what you buy cheap. companies that don't understand this don't last long... and gas stations are no exception. just simple economic theory... sure you can get more people in the door... but if you do it at the expense of maximizing profits, all you do is exponentially increase your losses.