At about minute 4:00 to 4:05 he describes three different airdam profiles. Showing examples, he describes the second variation as a fuel economy profile for an airdam on the ecoboost engine. It's a very different shape than the one that most of us, including myself, generally create.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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