2011 Challenger R/T Classic
This is a good point. Small turbo engines in large vehicles have been notorious for coming nowhere near the EPA ratings out in the real world. See all the lawsuits against Ford as examples.For an engine that is less then half the size of the 6.4 I would've thought that highway mpg would've been at least 22. It's really not much of a gain at all, and the minute you're into the turbos it will go south quick. That's why nothing much was said about it ever. But comparison, the Navigator gets 23 mpg.
So realistically the 3.0 is going to make slightly more power than the 6.4 on paper, in the real world the 6.4 will likely "feel" stronger because it'll deliver the power effortlessly, and the fuel savings on the 3.0 will be non-existant. In addition, I bet the longevity won't be there. Will the 3.0 be a few-hundred-thousand mile engine like the Hemis?