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Flaxmoore t1_irnrf9d wrote

And it takes very little to change the efficiency.

I had a car bra for my 3 series- E36, the last of the boxier models- and with nothing more than smoothing out the bumper/fender transition and adding a couple small wedges to direct air a little I got a full mile per gallon highway improvement.

That's over a full summer of testing, with the same drives done over 50 times. Held up nicely- 30mpg highway without it, 31 with.

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