[diesel_john]

Drawbar hp is similiar to rear wheel hp for the car buffs. Flywheel hp can be a bit miss leading since that accounts only for the engine not the complete drive train. Tractors are rated at full load. The wheel slip % is optimized for max. efficiency on concrete. If a car had a very small direct injection engine/alternator/motor drive train so it could operate at the sweet spot all the time and no traffic constraints. Then it could exceed the tractor efficiencies, because tractors have hydraulic operated power shift transmissions not electric.