In short - NO! Power at the wheels is not reliably comparable across different dynos or test conditions. For accurate benchmarking, using engine power and torque is far better. When properly measured, these values match manufacturer specs and allow consistent comparison between different dynos, setups, and sessions. In the U.S., the focus on wheel power is very similar approach as their use of non-metric units - an outdated, non-decimal system that lacks linear consistency. Like the units themselves, this approach is often messy and imprecise. And fundamentally, the engine, not the wheels, is the true source of power. Wheel power readings suffer from a lack of standardization. Key issues include: Undefined corrections: Dynos apply different methods—some show raw power, others apply inertia compensation or use standards like SAE J1349 or DIN 70020. Coastdown loss variation: Some dynos subtract drivetrain losses, others don’t. Results vary, especially between roller and hub dynos. Environmental influence: Weather conditions directly affect uncorrected wheel power. Inertia effects: Without correcting for vehicle component inertia, results change with gear selection, roller mass, and acceleration rate. Heating effects: As gearbox oil, differential oil, and tires warm up, power readings shift—especially if coastdown losses aren't measured. Setup variability: Changes in strap tension or absorber load can skew results. So again, the answer is clear: “Engine power and torque provide standardized, repeatable, and meaningful results; wheel power readings exist purely out of habit, not accuracy.”