Blowing past the speed limit on the highway lowers your car's fuel efficiency. So relax, and set the cruise control to save your sanity and gas.

If just o... read full tip

Blowing past the speed limit on the highway lowers your car's fuel efficiency. So relax, and set the cruise control to save your sanity and gas.

If just one driver traveling to New York from Boston on weekends for a year set the cruise control to 65 miles per hour instead of keeping up with the 80-mph crowd, the savings would equal about two-and-a-half barrels of crude oil. That's enough gas to drive coast to coast.

FuelEconomy.gov