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Well, I can say for sure the owners of the van never get anywhere near that. When I drove it home for them, they had averaged 22 mpg with it before I filled it up.
I'd say at modest speeds, 40+ is possible even without mods. My traveling was probably half at around 55 mph and the rest was 65-70 mph. It was at night though, very little traffic (no slow downs). If it were all at 45 mph, I'd have gotten 40 mpg no problem.
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