Avoid aggressive driving. "Drive as if you had a hard-boiled egg between your foot and the gas pedal," says John H. Davis, host of PBS's MotorWeek. "It's OK to break the eggshell, but you can't squash it." By observing speed limits and avoiding abrupt starts and stops, you can increase mileage by 5% on city streets and up to 33% on the highway — that's $27 per 20-gallon fill-up.
Control your speed. Using cruise control automatically reduces the amount of fuel you burn on the highway. When you set your speed, keep in mind that gas mileage decreases dramatically when you exceed 60 mph. Stick to the right lane, and you can reduce your fuel consumption by up to 20%.
Lighten your load. An extra 100 pounds of weight reduces mileage by as much as 2%, the equivalent of 8 cents per gallon. In other words, you can save up to $50 per year simply by cleaning out your trunk.
Don't idle. If traffic is at a standstill, turn off the engine. An hour of idling can swallow a gallon of gas. Also, avoid long lines at drive-through windows. You'll save money by going inside.
GET YOUR CAR IN SHAPE
Tune up. Keep your spark plugs clean, your engine tuned, and your wheels aligned.
Replacing a clogged air filter can improve your gas mileage by 10%, saving up to 40 cents per gallon. Ignore the hype about additives -- from chemical mixes to mothballs -- that claim to boost mileage. They're not worth the money and may even damage your engine.
Take care of your tires. Keep tires inflated to the pressure recommended in your owner's manual. Soft tires use more gas, but overinflating your tires (as some mileage fanatics suggest) will mess with your car's handling.
