F14Scott
Well-Known Member
After owning dozens of ICE cars, my personal impression is that they get their best MPG after around 10,000 miles but before 75,000 miles. I postulate that is enough time for all the things that have internal resistance to break in (bearings, joints, rings, knuckles, etc.), but less than when engine wear reduces compression, and fuel and exhaust systems begin to foul. I know of no study that backs up my SWAG (scientific wild-*** guess).Sure. ICE vehicles with high miles don't make near the power that they do when they are new. It may not show up as a large decrease in fuel economy, but it certainly would when you're trying to pass, towing or any other activity that involves higher loads.
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