- Don’t speed. Gas mileage decreases rapidly at speeds above 60 miles per hour.
- Avoid quick starts and stops to improve gas mileage up to 5 percent.
- Turn off the engine to avoid unnecessary idling, which wastes fuel and pollutes the air.
- Use overdrive gears and cruise control when appropriate to improve fuel economy when driving on a highway.
- Clean out your trunk; an extra 100 pounds in the trunk can reduce fuel economy by up to 2 percent.
- Avoid loading items on the roof rack as it creates wind resistance and can decrease fuel economy by 5 percent.
- Tuning your engine according to your owner’s manual can increase gas mileage by an average of 4 percent.
- Keeping your tires properly inflated and aligned can increase gas mileage up to 3 percent.
- Change your oil. According to the U.S. Department of Energy, you can improve your gas mileage by using the manufacturer’s recommended grade of motor oil.
- Check your owner’s car manual for the most effective octane level for your car. For most cars, the recommended gasoline is regular octane. In most cases, using a higher octane gas than the manufacturer recommends offers no benefit.