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Interesting - though a small van would not seem to be really where they would shine. My gut reaction is 55mph is not very fast so air displacement is not a big deal with a relatively small frontage/length. However a rig at 55mph is a different matter in shifting air : )

A van doing 70mph would possibly be more effective test.

off the web

It is about the wind resistance and that increases as the square of the speed. 65 squared is about 40% more than 55 squared. The drag at these speeds dwarfs other power drains.
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