So basically, nothing.

[Corts60]

I notice nobody mentioning drive train. Friction is powerloss. So is is slop in gears. When were all wheel bearings last replaced? How many miles on the trans? What are the shift points set at on the trans? Last time you inspected back lash on rear end? Last time you inspected u joints? Do you have a carrier bearing? All these components will eat up up your power if they are not functioning as new. I'll bet if half the guys that think they need an engine rebuild were to replace those components first, along with checking proper tire inflation, alignment, etc., the improvement in their fuel mileage would probably make them say never mind on the rebuild.
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