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Old 04-19-2020, 08:24 PM   #7 (permalink)
Aero Wannabe
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Join Date: Dec 2007
Location: NW Colo
Posts: 686

TDi - '04 VW Golf
90 day: 47.98 mpg (US)
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Originally Posted by redneck View Post
I’m curious. Did you use the same rim and tire combination with and without a flat covering?
The short answer is Yes. I tried multiple combinations and the best of all were the alloy rims bare followed by the same tire and rim with a flat coroplast cover which was consistently worse.

More to come.

Edit- If this were a newspaper I would be printing a retraction. I posted the quick reply to the question above before looking at my notes. As I was entering the test data last night I realized that the coroplast wheel covers edged out the bare alloys by 1 mpg.
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.

Last edited by COcyclist; 04-20-2020 at 11:16 AM..
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