I have done several calculations. The formulas are available on line. The interesting thing is that flat running is not a good indicator of power or average consumption. The target maximum hill gradient, and accelleration are significant. At 25 mph demand will be very low, but how low I hear you ask.
What is the vehicle intended use? Seems hardly more than golf kart.
The local ammenity centre has small low speed vans, I will chech to see if they have any records of mpg!
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