I doubt that's the case.
I don't. When Galveston and Houston were being evacuated, more than the usual number of people had a demand for gasoline. Since, by law, gas station owners could not raise the price above what it was before the evacuation, the first people in line had every incentive to buy more gasoline than they needed. And since no more gasoline deliveries could be made, less was left for others further down the line, and eventually the stations ran out.
I'm not blaming the first people who were able to buy the gasoline -- I'd probably do the same thing. It's just a matter of economics.