[jdean]

J Persons, the loss from the drivetrain is not speculation, but has been proven with countless comparisons of FWHP compared to RWHP on the same engine. The ZF transaxle is not a fair comparison since it is both the transmission and differential in the same unit, so it is intrinsically more efficient vs a transmission, driveshaft, differential.

The chassis dyno vs engine dyno sometimes introduces sources for addition losses like exhaust systems or other accessories driven by the engine.