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Old 01-04-2021, 06:06 PM   #14 (permalink)
COcyclist
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Join Date: Dec 2007
Location: NW Colo
Posts: 738

TDi - '04 VW Golf
TEAM VW AUDI Group
90 day: 53.2 mpg (US)
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ScanGuage aero testing checks out

I had a few minutes today and dry roads before the storm coming in tonight so I decided to test my testing method. At Julian’s suggestion I did a total of 4 runs on my reasonably flat, straight 2 mile test road. 30 degrees F and winds calm (3 mph from the west according to the weather radio from the airport next to the road). I did an east and west run with the windows up and repeated the procedure with all the windows down and the cruise control set to 65 mph (63 on the GPS) for all runs. There was no other traffic on the road during the testing.

I averaged the windows-up runs and got 51.05 mpg.
I averaged the windows-down runs and got 48.05 mpg.

That is almost a 6% difference so I feel pretty good about the ScanGuage current mpg test model.
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https://ecomodder.com/forum/showthre...tml#post621801


Quote:
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.
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