Duh. Whoever thought this up obviously didn't take Econ in college.

If you drive on 05/15, you're still going to gas up at some point in time to replace the fuel consumed. Whether you pay on that day or you pay another day, you're going to pay at the pump. The impact to the gas companies will be minimal.

A greater impact would be felt if there was a moratorium on driving for 1 day but that ain't gonna happen.