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On any machine look at the power to weight ratio and the rpm of peak torque. The aero drag force at speed determines the power needed. Note that Charlie Perethian used a Honda 250cc single to get 157 mpg at the Vetter Challenge that is very similar to the new CBR model. The high mpg records of the 80's were set by 125cc bikes with full body fairings.
Over the years in the auto parts business I sold tons of belts of all types. The manufacturers such as Gates and others offer a wealth of information.
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