• Have your car tuned regularly. An engine tune-up can improve car fuel economy by an average of 1 mile per gallon.
• Keep your tires properly inflated. Under-inflated tires can decrease fuel economy by up to 1 mile per gallon.
• Slow down. The faster you drive, the more gasoline your car uses. Driving at 65 miles per hour rather than 55 miles per hour reduces fuel economy by about 2 miles per gallon.
• Avoid jackrabbit starts. Abrupt starts require about twice as much gasoline as gradual starts.
• Pace your driving. Unnecessary speedups, slowdowns and stops can decrease fuel economy by up to 2 miles per gallon. Stay alert and drive steadily, not erratically. Keep a reasonable, safe distance from the car ahead of you and anticipate traffic conditions.
• Use your air conditioner sparingly. The use of air conditioning can reduce fuel economy by as much as 2 miles per gallon under certain speeds and operating conditions.
• Avoid lengthy engine idling. Turn your engine off when you are delayed for more than a couple of minutes.
• Plan your trips carefully. Combine short trips into one to do all your errands. Avoid traveling during rush hours if possible, to reduce fuel-consumption patterns such as starting and stopping and numerous idling periods. Consider joining a car pool.
(Source: American Petroleum Institute)