1. Use Cruise Control for steady Speed Limit After 50 mph, every single mile per hour increase reduces your fuel economy by .1 miles/gallon. Using cruise control of your car on highways helps maintain a constant speed and saves gas. Ralph Teetor, a blind mechanical engineer, who refined the technology in 1945 to invent today’s modern automotive cruise control. In GT Dubai Car Test , using cruise control revealed up to 14% savings in fuel economy with an average savings of 7%. Here's an important tip, according to gtautocentre.com : you should turn off cruise if you are in a mountainous area. It will try to keep you up to the speed you've set and to accomplish this use a lot of extra gas downshifting to lower gears. Also, don't use it late at night or when you’re tired: and don't use it when driving in slippery condition. It’s better to use a car equipped with adaptive cruise control. This allows the driver to set a desired speed, while the system a...