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Mythbusters did a test on it.
100ft behind was something around a 20% gain in MPG, 50 feet was 30% about, and it scaled all the way up to 20ft behind with a grand total of about 43% gain in gas mileage. I forget what episode it was but I think it was this season, which is season 12. They used some big v8 american car.
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1999 VW Jetta Trailer
1998 VW Jetta TDI
1997 VW Jetta Project Car
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