On flat highways, cruise control saves gas by keeping you rolling at a steady pace. But turn it off on hills, where it is actually less fuel efficient because it forces the engine to constantly rev up and down to maintain your target speed.
Save Money on Gas
Don't let record-high fuel prices break your vacation budget. You probably already know that being a miser with the air-conditioning, keeping your tires properly inflated and getting a tune-up will all improve your mileage. Here are other smart ways to scrimp:
Be Savvy With Cruise Control