Quote:
Originally Posted by D_Bat
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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I saw this one as well. 100 feet is almost two big-rig-lengths--enough to easily be out of the danger zone. When I'm travelling the same speed as big rigs around me, I'll generally stay behind them by 100 to 150 feet. It seems to make a difference in my overall mileage.