Quality

Rat Bastid said

That’s some of it. But machining techniques and EFI are really what has made longevity much higher.

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That and gearing. I used to cruise at 80 mph or better with my old stuff, 3.23 gears, no overdrive - 3500 rpm. New cars, 6-8-10 speeds, same mph, 1500-2000 rpm.