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I read this topic about a month ago and decided to do my own test. I drove 70 miles per day back and forth to work through one tank of fuel with the louvered tailgate on. Then I put the stock tailgate on and drove the same route through one tank of fuel.
Conclusion: I wasted money buying the louvered tailgate. I will try to sell it on ebay. I got almost 2 miles (13.8 - 15.6) more per gallon with the standard tailgate on. I now have the hard cover on and for some reason my mileage looks really bad. I think the reason is that I am using my auto-start and warming up the truck a couple of times every day. Can't wait to get away from the ice, snow and cold here in the icebox of northern Illinois. They have the winter additive added to the diesel fuel now - and I know that lowers the mileage.
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