Tip #5. Use cruise control
If you use cruise control on the highway, it helps you maintain a constant speed and is yet another of many ways to gas savings. Drive steadily, and not riding the brake or gas pedal. Slowing down, or speeding up, wastes a tremendous amount of fuel and it will not improve fuel efficiency. Using cruise control cuts down on those unnecessary speed changes which eat up gas. It also prevents "speed creep." which is the tendency for a driver's speed to gradually increase with time spent on the road.