I'm going to take a wild guess and say that the guy doesn't actually calculate his gas mileage. He probably also doesn't fill the car the same way every time. Simple math is involved, so that knocks out quite a few people.
I had an '05 350 and I averaged between 19 and 20 for the mixed driving that I do. The best I ever got was on a long trip which was just shy of 28. It would have probably been a little higher, but I can't bring myself to drive like I'm in quicksand.
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