Keep Your Car in Shape
* Replacing a clogged air filter can significantly improve gas mileage.
* Keeping tires inflated to the recommended pressure and using the recommended grade of motor oil can improve fuel economy by up to 5%.  The manufacturer’s recommended tire pressure can be found on the tire information placard and/or vehicle certification label located on the vehicle door edge, doorpost, glove-box door, or inside the trunk lid.

Plan and Combine Trips
* A warmed-up engine is more fuel efficient than a cold one.  Many short trips taken from a cold start can use twice as much fuel as one multipurpose trip covering the same distance when the engine is warmed up and efficient.
Note:  Letting your car idle to warm-up doesn’t help your fuel economy, it actually uses more fuel and creates more pollution.

Drive More Efficiently
* Aggressive driving (speeding and rapid acceleration and braking) can lower your gas mileage by as much as 33% at highway speeds and 5% around town.
* Observe the speed limit - each 5 mph you drive over 60 mph can reduce your fuel economy by 10%
* Avoid idling - idling gets 0 miles per gallon!

(the above is from www.fueleconomy.gov)