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For a moment lets separate hypermiling into two categories. Average speeds over 50 MPH, and average speeds under 25 MPH. Close to the EPA highway speed average and the city speed average.
When I read about someone getting 80 MPG, but the missing information is average speed, it's usually because the average speed is less than 25 MPH. I have driven 575 miles in one day averaging close to 55 MPH and at just over 70 MPG, in a car with an automatic transmission. That's about 10 hours on the road in one day, not 24 hours at 23MPH trying to get 96 MPG.
The solution for me is a motorcycle, which I can ride at normal traffic speeds and still get close to 80 MPG average. Maybe one day I will get some aero mods to the bike to get it to 100, with some sprocket changes and a riding style that minimises frontal area.
If I did all that and went 25 MPH I guess I could get 200 MPG, but to me it seems a little weird to drive or ride in such a way that a good bicyclist could just about match your average speed and use no fossil fuel.
regards
Mech
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