Love mine. 13-15mpg around town and 17-18 Highway. It will do everything that I need it to do. It's a '17 , bought it new.
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I have a Gibson Performance cat back system on mine and modified it slightly to exit it where I wanted it to. Love it. And installed it myself.
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I have a 17 2500 with the 6.4 . The past 2 years took a 2500 mile round trip and averaged 17.0 at highway speeds 65-75. Actually it impressed me.
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If the topper is roof high, it won't effect the aero at all. Gas mpg really shouldn't be affected either. I have a 2017 ram 6.4 with a topper that is higher that the truck and I get 17mpg highway. Here is a picture of my truck.
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I too have the same model 22a. And it is a hydro-boost system. Maybe what he has is a lighter duty , load rating so to speak.
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