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I have not done any ABA testing of it but I do know that when I turn on the ac in my car the SG readings drop 2-5 MPG. the windows down has little to no impact at speeds up to 55 MPH, from 55-70 MPH its a toss up (not sure with my tail have not been that fast when it has been hot out). over 70 MPH the AC starts to be better.
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