Your vehicle's aerodynamics play a huge role in fuel economy. Towing a trailer is the worst idea, so try to pack light instead. If you want to bring bicycles or other gear that won't fit in the car, attach a rack to the back of your trunk rather than mounting it on top, to minimize wind drag. You can read more about this and 103 other fuel-saving tips at ecomodder.com
Save Money on Gas
Don't let record-high fuel prices break your vacation budget. You probably already know that being a miser with the air-conditioning, keeping your tires properly inflated and getting a tune-up will all improve your mileage. Here are other smart ways to scrimp: