From the comments to this post:
Where can we report gas stations that are price gouging when a hurrican is in the gulf?
To competitors who are not. They'll be happy to hear it. You might also try reporting it to texasgasprices.com so that customers can be informed. That will do more good than reporting it to some government agency.
Never mind that these things have been investigated by government before, and the search turns up empty.
Gasoline is scarce and must be rationed somehow, someway. If everyone is told to evacuate an area, it becomes even more scarce in that area. If we don't allow the prices of gasoline to rise, how then is it to be rationed? And, pray tell me why that way of rationing is better than using prices.