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Running under powered vehicles on the road is one of the most annoying things other motorists have to put up with when they get stuck behind them.
A diesel makes far more sense because you could lug a tall gear at very low rpms to cruise at 65mph and achieve far better BFSC at that load than a small asthmatic gas engine spinning its heart out trying to achieve 65mph into a head wind. Unlike diesels , gas engines do not get great mpg when they have to run under load all the time. Diesels love wide open throttle, but if you look at mpg for 4 cylinder SUV's you will find their mpg is worse than most gas V8's - simply because those little engines are always working hard.
My 2 cents
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