In contrast to a fossil car, an electric car has greatly increased energy consumption at higher speeds. This is due to increased air resistance at higher speeds. Air resistance increases with the square of the increase in speed. This means that if you increase the speed from 100 km/h to 110 km/h, the air resistance increases by 20%. Air resistance accounts for approx. 35-40% of the car's total energy requirement according to the WLTP cycle. This is something that electric car manufacturers are working hard to reduce. For example, some cars have cameras instead of side rear-view mirrors.
The fact that the difference is smaller for a fossil-fuel car is due to the fact that an internal combustion engine is relatively more efficient at higher loads. The efficiency is so bad that much of the energy is wasted as heat regardless of speed. A fossil car consumes more fuel per mile in city traffic than on highway driving, while for an electric car it's the other way around!
As air resistance is such an important factor for energy consumption in your electric car, it is of great importance not to have anything unnecessary on the car that increases air resistance, for example a roof rack that is not used. As soon as you no longer need your roof rack, it should be removed so as not to waste an energy unnecessarily.
The Northrack Soft Roof Rack can be attached and removed in just a few minutes, completely without tools or profanity. A simple way to save energy and increase range.