You guys are forgetting that it is an 8000 lb truck. I have a tuner, intake and a 4" turbo back exhaust. While drafting behind a semi trailer (very close) on a patch of interstate at 65mph, I was able to get a hand calculated 20.5 mpg. Now you are going to try and tell me that he is getting another 12 mpg better than that???
Also the fact that it's a 7.3l, not the more efficient 6.0l.
Not even with a rocket strapped to the back of it.
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