I think he should find one gas station owner in every large city and pay them to offer gas for 4 hours, using the same price it was when Bush left office. He pays them the difference.
It would get media attention in every market, and make people think.
I live in a small city and that is almost what has happened.
Walmart (Murphy Oil) opened a new station and set the price at _$.10 per gallon. The other nearby stations followed and the doen cycle continued. The price is now down -$. 45 and has spread all over town.