Take it easy
Rapid acceleration and sudden braking can lower your gas mileage by 33% at highway speeds and by 5% on city streets. Is added gasoline cost worth the time you might save? Accelerate smoothly to a speed that can be maintained steadily without the need to slam breaks or take corners aggressively.
Watch the weight
Any increase in vehicle weight will substantially lead to increase engine workload which easily translates to poor gas mileage. According to thefueleconomy.gov website, even leaving an empty box on your roof reduces fuel economy by around 2% to 8% in city driving, and up to 25% on the highway.
Inflate tires to correct pressure
One of the easiest way to improve your gas mileage is inflates your car tires to correct pressure. Running on low tires pressure increase the rolling resistance of your tires on the ground.
Stay Cool
Increasing of the temperature in the car causing the workload of AC increase. Window film is the best choice to stablilize the car interior temperature. Window tinting offers another angle on saving money, aside from conserving fuel by running the air conditioner less often. With a reduced dependence on A/C, your cooling unit will last longer and require fewer expensive repairs.