Quote:
Originally Posted by Frank Lee
The 4WD stuff does add weight and usually a taller, dirtier aero profile. And even in 2WD mode there's more drivetrain stuff spinning even if it's only in the transfer case- a larger drivetrain loss.
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But it's not just the transfer case. The front axles and driveshaft still spin in 2WD, it's just that the tires are turning them instead of the engine.