Try to keep your high speed between 40mph and 55mph. Speeds above 55mph can decrease your gas mileage by more than 20% due to wind resistance.
Avoid fast take offs
Quick acceleration from a standing stop is a real strain on the engine and burns fuel at an extremely wasteful rate. In rush hour traffic, leave enough space between you and the car in front of you so that you can keep your car in motion, Even if you’re travelling at 5mph, it’s better than stop-and-go driving.
Close the windows on the freeway.
Driving with the windows down at higher speeds causes a lot of drag, and can reduce your mileage by as much as 10%.
Shop for gas.
The price of gas can vary by as much as $0.20 per gallon. Shop for the lowest priced gas within a three-mile radius of your home or work.