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Originally Posted by mpg_numbers_guy
I've never witnessed any efficiency degradation in any ICE vehicle besides from general maintenance like spark plugs and the like, regardless of age or mileage.
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Never driven air-cooled VWs then. Once they age to the first rebuild, you're dependent on rebuilders. It's never quite the same.
I just had one cylinder down to 90lb of compression. Fortunately re-torquing the head brought it back.