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Old 11-27-2007, 10:33 PM   #9 (permalink)
MetroMPG
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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Fancy Metro - '14 Mitsubishi Mirage top spec
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09-10-2006, 09:42 Am

Here's some info to use for an edumacated guess:

According to: http://www.tfd.chalmers.se/~lelo/rvad/reports/rva2002_gr02_underbody.pdf

Audi improved the Cd of the A4 with a patchwork of panels applied to the underbody. The sum difference was Cd -0.019



Assuming my continuous smooth under tray achieves at least that difference in Cd on the Blackflea, the rolling & drag spreadsheet tells me I should see a FE improvement of 4.6% @ 20 C @ 55 mph

EDIT: that's a slightly conservative estimate, since the Audi calcs apparently do not include the large front panel.
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