At highway speeds, more than 50
percent of engine power goes to overcoming aerodynamic drag. So don't carry
things on top of your vehicle when you don't have to. Installing a large Thule
Cascade 1700 car-top carrier on our Camry dropped its gas mileage from 35 mpg to
29 at 65 mph. Even driving with empty racks on the car reduces its fuel economy.
Sri Lanka, Colombo
Providence, Rhode Island