Pump squeeze

I've attempted nearly every trick possible to save money on gasoline. Completely filling my tires and taking the heavy junk out of my trunk saved a little, but not very much. As of today, York County's average price for regular gas stood at a record $3.328 per gallon. For now, the only way I've found to save gas is to use my reward points accrued at local supermarkets. How do you save gas? What tips can you offer that have kept your gas budget afloat?