Different driving habits do help with fuel efficiency, but I get at best 8 mpg and that is true. With a c7 cat turbo deisel 350 hp,most will say they get way better but that is rarely the case in actuality I have a eco meter that tells the mpg and they are not always correct. Most 41' deisel pusher will average 6 to 8 mpg and 10 if you are lucky. That Is a factory un touched not turned up fuel systems..people have a tendency to get in there and turn them up or tune but then the damage starts, leave them be or ultimately no more then a small tune or program.. but my opinion is deisel is more efficient then gas
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