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You might toy with the idea of replacing the front sprocket (15 tooth) with a 16t. It will lower your rpms at the higher speeds and you might get a little more top end speed. I reach close to 75 mph and I am 6 ft and 170. It increased my mileage as well. The best I have done is about 80mpg with mostly 45 to 50 mph commuting.
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