That’s a smart question. Transmission losses depend on gearbox type, oil viscosity, tire friction, and even temperature. Estimating them manually is often rough. A better approach is dynamic coast-down measurement, where deceleration data is used to estimate resistance. The modules Dynotest https://dynotestpro.com/ automate that process, calculating losses directly in relation to your car’s performance. That means the results reflect your actual drivetrain, not just an industry average. It’s a reliable way to understand how efficiently your setup transfers power to the wheels.