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It does make a difference but its not the end of the world. You will see a much bigger hit on MPG at highway speeds. I put them down in town because it makes a bigger difference to hit all green lights or not stopping. ( If you can, stop signs are a *****.) Having the windows up or down only does a little at 30MPH. At highway speed It will shorten my coasting distance drastically and probably give me a big hit to FE. BUT if its 110*F and I don't have AC my windows will be down.
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