Estimate how driving speed and outside temperature affect your range
Air resistance increases with the square of speed. At 130 km/h, your car fights nearly 5 times more drag than at 60 km/h. This means small speed reductions have a big impact on how far you can drive on a tank (or a charge).
Our calculator uses the drag coefficient (Cd) and frontal area we hold for each car to compute aerodynamic losses. Where the manufacturer publishes those figures we use them. Where nobody publishes them we fall back to a body-type estimate, and the tool labels that car "Estimated Cd" so you can see which is which.
Most petrol and diesel cars achieve their best fuel economy between 80-90 km/h. EVs are most efficient at 60-80 km/h because they have no engine to lose efficiency at low RPM. Driving at 110 km/h instead of 130 km/h can improve range by 15-25% depending on the car's aerodynamics.
A car with Cd 0.23 (like the Tesla Model 3) slips through the air much more efficiently than one with Cd 0.35 (like a boxy SUV). At highway speeds, this difference translates to 20-30% more range. We hold a published drag coefficient for some cars and estimate the rest from body type.
Range and fuel consumption estimates use manufacturer-published drag coefficients and frontal areas where available. Cars without published data use estimates based on body type. Real-world results vary with wind, gradient, temperature, tyre pressure, and driving style. Results are approximate guides only.
Search and add a car above to see the speed vs range calculator
Add up to 4 cars to compare their efficiency at different speeds