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  1. I'm into hypermiling. Most times, my gas mileage is better than EPA's. Rarely, it's not. My 2004 Audi A4's EPA had 30 mpg highway and my average was 36 after over 1,000 miles despite 20% being city. Then it was a new 2008 Benz C300 that supposedly got 26 mpg according to EPA but I could barely get 24 out of it. Tires were properly inflated, but other owners said that it was common. A lousy 177-hp V6! The Audi had 170-hp. I learned not to trust the EPA numbers. I suspect they use soccer moms who keep both feet on both pedals simultaneously. Then I had the new 2012 Ford F-150 4x4 with a 365-hp V8 that got me 22 mpg on the highway, not too bad since EPA's estimate was 19 mpg highway. When I got a new 2016 with the same V-8, with the power slightly increased at 385-hp, my gas mileage average was initially 20, but dropped to 17 after I added a shell on it. I thought a shell would help but a lot of forums didn't agree. I didn't use the computer, I measured the gas since Ford's tend to be around 5% to 8% optimistic while Chevrolet's is usually spot-on (that was what I read and have been told). The 2019 Silverado supposedly has the lowest wind resistance of all the pick-up trucks. EPA numbers show 22 mpg on the highway. My last trip was 28 mpg, not bad for a 355-hp V8. I don't think the engine revs at over 1,500 whilst going 60 mph. I am almost sure I can do better than 28 mpg because about 10 to 20% of that was in stop and go traffic. I am not adding a shell for sure, don't want to mess it up. I thought the Z71 package would make the gas mileage worse with the slightly more aggressive tires since wind resistance is a big factor. Getting 28 surprised me, I'm very happy with the fuel economy. I am old school, am still leery towards small quad-turbo charged engines. I read about owners disabling the troublesome active fuel management which resulted in almost no difference in gas mileage, but since Chevrolet did a lot of quality control on the 2019 dynamic fuel management, I don't expect that to be a problem. Has anybody achieved better gas mileage? No going downhill, just on a flat surface going 60. Just about everybody who doesn't own one or doesn't watch the gas mileage would say a tonneau cover helps, but Mythbusters disagreed, along with several who own trucks with tonneau covers.
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