This reduces both fuel consumption and engine wear. Use cruise control. Using cruise control on highway trips can help you maintain a constant speed and, in most cases, will reduce your fuel consumption. Avoid 'fuel-wasting' accessories. Avoid excess weight .
Heavier cars use more gasoline than similarly powered lighter cars.
Check your car or truck and remove any unnecessary items. For every 100 pounds you remove, gas mileage increases from one percent to four percent, depending on the size of the car and the engine. Maintain proper tire pressure. Underinflated tires increase rolling resistance which in turn decreases gas mielage. Check pressures when tires are cold.