Quote:
Originally Posted by 3-Wheeler
I think what that person might have meant was, your total gain from the tail really will be 20 to 30%, but because rolling drag and air drag are equally split regarding affect on the vehicle, the aero benefit is cut in half, so you end up with an effective gain of 10 to 15% from the aero side of things.
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i meant that a good tail should increase the mpg by 20 to 30% above the EPA rating, without using any driving techniques. Driving techniques can easily add 20% or more on top of that.
If a car is rated at 30 mpg, one should see results of 36 to 39 mpg with the addition of a tail and no driving techniques.
Its just a rule of thumb, not a rule.