Screw the gas tax holiday, how about a driving holiday? 

Make it a week.  No driving except for emergencies (I am talking the hospital, late for work is not acceptable).   No purchases of petroleum either.  This is the real point.

Summer is best because people can line up their vacations with it and folks can bike or walk more easily.

It could be all wrapped up in the American flag as a patriotic thing to do as a duty to your country.  In the not too distant future we will  be asked to make some pretty hard core sacrifices and this is a good way to get things off on the right foot.