I was just volume-gouged on gasoline today in Atlanta. I was returning my rent car, and needed to fill the tank. Stations here seem to fear a hurricane-related gas shortage, to the first station would only sell me 10 gallons maximum. The second claimed to be out of gas. At the third I was able to fill my tank the rest of the way. These stations gouged me on volume, simply because they didn't have the simple courtesy to re-price their product upwards in a shortage in order to ensure continued availability of supply.
By the way, memo to news guys -- telling everyone to run out and fill their tanks RIGHT NOW in order to avoid a possible gasoline shortage will only precipitate said shortage. If everyone fills his or her tank at the same time, this shifts inventory from large regional reservoirs to individual reservoirs (e.g. gas tanks), the most inefficient of inventory storage models. Having every car's gas tank go nearly instantaneously from 5/8 full to full requires something like 600 million gallons of draw down from retail and wholesale inventory to car fuel tanks. The system cannot survive that in 24 hours, and the hypothesized shortage becomes a reality.
Postscript: By the way, the question of whether to run out and fill your tank tonight is a classic prisnoners dilemma game. We are all better off if no one does it, but each invidividual probably maximizes his or her well-being by deciding to fill up, so everyone does it.