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Old 04-20-2020, 05:23 PM   #16 (permalink)
Frank Lee
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Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

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Originally Posted by COcyclist View Post
Kudos to anyone who decides to do A-B-A testing. To do it right takes time and ideal test conditions to get good results. <> There seemed to be more variation with changing wind perhaps, than the variation of wheel covers on or off.
Back in another epoch I did a college paper on aerodynamic devices and road-tested the standard fare: air dam, skirts, shovel-nose grille block, mirror deletes, etc. As much as I wanted my devices to create earth-shattering improvements to be honest they didn't rise above the signal-to-noise ratio of on-road testing and I had to admit as much in the paper. One reason I'm loathe to make mpg claims for mods is I know first-hand how hard it is to get good trustworthy data.

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