I'm lucky to get 10mpg on my 2001 7.3 (yah, OLD and that is mostly without even towing the chipper), but I live in a VERY hilly place and the highest speed limit in the entire county is like 45mph, so I never get anywhere near highway efficacy. That said, the new 7.3 gas seems like a great engine and in like 3 years, if it still holds up I'd love to replace my current truck with a 450/550 gasser.
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