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I doubt the fuel economy gauge is accurate in 4cylinder mode. I know my 5.7 Hemi with that feature was way off, as was the scan tool I had running with the Torque app. I also agree with the above, lower it but keep the air dam and still skin the bottom. Removing the air dam isn't going to decrease frontal aera one bit as everything else under there, like the rear axle, is just as low and the rear axle wont move an inch with a lowering kit.
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