I don't see much progress as you might think. I had a 72 Triumph 650 Tiger (a twin cylinder with single carb, ignition points). It would get 60 mpg at 70-75 mph.
My current 78 Yamaha SR500 and 79 XT500 bikes get about the same.
I am not saying that these old bikes ride as well or are as reliable but the fuel mileage is very similar. These new machines should be getting 90 mpg stock.
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The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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