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Old 01-01-2012, 10:32 PM   #6 (permalink)
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Join Date: Dec 2007
Location: Eastern CT, USA
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Outasight - '00 Honda Insight
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I have no proof, no math.
But seeing the problem of rear drag as being caused by sucking a big vacuum behind the vehicle - if something were filling in that vacuum from behind, the "lead" car's fuel economy should improve. It doesn't have to create that vacuum all the time, so it gets a free ride, relatively speaking.

Of course, I think that trying to take advantage of this would be even more hazardous than tailgating. Please don't do this!! A square-front bus, following a close distance behind you, would likely do a good job of filling in your rear vacuum. But I wouldn't feel comfortable driving that way. I'd rather have the bus a hundred feet back.
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.

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