Dave - That's MPG at cruise. If you load them both heavily, the mpg gets closer. However, the gasser has less torque, so it needs more gearing. If they were both geared as tall as they could get away with, there would be a difference still, but not a massive one, when cruising empty.
Basically, you could probably see 20 out of a V10 Ford, but you'd have to gear it to turn 800 rpm at 60 or something ridiculous to do that. Plus, you'd probably need to mod the engine a bit for it to be efficient enough at that rpm.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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