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This seems like strong language for such a limited experiment, and you were originally comparing bikes to cars to make the statement. Tire inflation and size, clutch design and adjustment, chain tension, loading, brake adjustment, bearing condition all come to mind. I mean Matsuzawa got 470mpg with a chain drive, it is no wet dream, no handicap.
As I attempted to point out, chains often don't get optimal consideration at installation, but minimizing "stretch" and contamination are trivial to do. My v65 doesn't coast so great, but there are a lot of variables so I don't leap to "it must be the driveshaft"...
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