People waited since midnight to get .99 cent gas with a limit on 15 gallons. Would you wait all night long in order to save fifty bucks? That is assuming you of course could use the entire 15 gallons which means your tank would have to be very close to empty or large enough.
If you do the math that works out to about 8 dollars an hour to spend the night on the side of the street while waiting for the 6 a.m. start.