Hurts the engine? Haha... wow... some people are so stupid.It's ridiculous. I can't tell you how many times I've seen/heard something along the lines of "I want more power but I don't want to go above 2000 rpm. Wastes too much gas and hurts the engine."
Ignorance at its finest. You have to learn from those who actually have experience with these engines and can't base your decisions off of 2000 rpm in a Jeep straight engine.
And in addition to that, if you want good fuel economy you shouldn't even own a Jeep / truck / 4x4.
Honestly, it amazes me how dumb some people can be.