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I will echo what Aerohead said. When I built and attached the SedanKamm to my car, I didn't see much difference around town, and even on the interstate I noticed little difference... for the first half of the trip! Overall, on interstate travel I saw a 6% gain in fuel economy, but that was over 1800 miles of 65-70 mph driving that it all averaged out. If I had gone with the first 800 or 900 miles, I would have been VERY discouraged!
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