[E.Roy]

I'm disappointed that axle manufactures haven't invented a better way to disconnect front hubs from axles. So most trucks have parts spinning despite 4x4 not being needed, wearing them out. Stillsearching, aerodynamic drag can be a large difference between 2wd and 4x4 in 3/4 & 1 ton trucks if these have a solid front axle. Also transfer cases that hang down drag on the air.

Often, 2wd trucks have lower final drive ratios, say 3.55:1 vs 3.73 or 410. Also, they may be equipped with lighter, narrower and less aggressive tires from the factory.