Experiments have shown that an empty roof rack reduces a gasoline powered car fuel efficiency by up to 12%. Of course, roof racks are often used to carry bulky objects like bicycles, storage boxes, and outdoor recreational gear, and mounting these types of objects on your roof could reduce efficiency by 30% or more. Electric vehicles are far more fuel efficient than gasoline powered cars. The best electric vehicles convert up to 95% of their stored energy into mechanical power, while a gasoline...
