What happens next?

How to improve your gas mileage and save money
Use common sense in your driving habits to reap immediate reductions in fuel consumption, wear and tear on your vehicle, tires and brakes, thus expense.
Accelerate smoothly and gently when leaving intersections and stop signs. It is inconsiderate of other drivers and even contributes to congestion at intersections, to dawdle once the light turns green.
But it isn't necessary to hit the gas with a heavy foot either. The harder your engine has to work, the more gas you burn.