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Air pushed to the sides will interact badly with nearby objects (barriers, tunnel walls, other vehicles). Air allowed under the car will wind up producing if not horrible drag, then at least downforce (drag). Lowering your air dam to cut down on the air passing under the car will increase surface area (drag).
The three laws of thermodynamics come into play here:
1. You can't win.
2. You can't break even.
3. You can't even quit the game.
There is no right answer, and the least wrong answer varies depending on what you have and how & where you use it.
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Quote:
Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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