Gas prices are going up each time people turn around. I think consumers deserve the blame as much as the oil companies. If everyone fills up his tank, by the end of the day the stations will run out of gas, which makes them order resupply from the wholesaler, who in turn jacks up the prices due to increased demand.
On the other hand, if everyone puts in only a quarter tank of gas each time, the gas stations will have their inventory last for four days longer, hence will have to reorder less frequently, resulting in a stockpile at the wholesaler, preventing sharp price jumps.
There is a gas station every few blocks nowadays. A person shouldn't worry about the tank getting empty unless he is driving through the Mohave Desert.
If every American heeds this advice and follows through, I bet the gas prices won't jump up.