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I keep thinking that a 6.8-liter V10 can't be equally as efficient on a 20,000-pound Challenger as in a 12,000-pound Axis (aside from 2-valve versus 3-valve difference). One has to be too large or the other too small.
I'd guess there is a real technical opportunity to rightsize an engine for an Axis-size motorhome much below 6.8 liters of displacement. I also think buyers wouldn't want it unless it increased MPGs by an unreasonable amount. I can see where manufacturers are facing a tough marketing challenge versus regulation requirements.
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