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I'm not so sure diesels have less friction. In spite of turning lower rpms, they typically have longer strokes; interestingly enough there are many gassers that run 1000-1200 ft/mn piston speed while the two stroke diesels anyway are running 1700! The ring pack is the largest single contributer to friction so higher piston speeds must lead to higher friction.
Plus they have heavier rotating/reciprocating parts which add friction.
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