Coast to red lights
As you are approaching an intersection, stop pressing your gas pedal as soon as you recognize you will not be able to pass through. You will prevent wasting gas to propel your car forward toward an eventual stop, you will reduce wear on your brakes by taking advantage of the stopping power of wind resistance, and if you have not stopped by the time the light changes back to green, you will be likely to have maintained more of the forward momentum your vehicle already had.
Driving too close to the vehicle in front of you forces you to use brakes more often. Unless you are in heavy traffic, you should only rarely need to use your brakes on the highway. Every time you use your brakes, you are reducing the gas mileage of your vehicle. An added bonus is the reduced likelihood of getting in a car accident.
Don’t speed on the highway.
Motor vehicles today are engineered to optimize efficiency around 65 miles per hour. When you travel above that level, you will sacrifice the distance traveled per gallon of gas.
Aggressive driving wastes gas and can lower your mileage by 33 percent at highway speeds and 5 percent around town. Sensible driving is also much safer for you and others.
Maintain your vehicle
Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4 percent, though results may vary based upon the type of repair and how well it is done. A faulty oxygen sensor can harm your mileage by as much as 40 percent.
Keep your tires properly inflated
You can improve your gas mileage by around 3.3 percent by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by .4 percent for every 1psi drop in pressure of all four tires. Properly inflated tires are also safer and last longer.