Make sure your brakes are properly adjusted. Do not weave . Avoid weaving, sudden accelerations, and lane changing in heavy traffic. Such practices waste fuel. Avoid excess weight.
Heavier cars use more gasoline than similarly powered lighter cars.
Check your car or truck and remove any unnecessary items. Clean out the trunk. For every 100 pounds you remove, gas mileage increases from 1 percent to 4 percent, depending on the size of the car and the engine. Tests have shown that you pay a two-four miles per gallon penalty for running the air conditioner in city traffic. On the highway, get out of the habit of rolling down your windows and instead open the vents.