I would aggree with running the 2.5 at higher rpm's to get more speed out of it, but I for one still am not what I would call happy with the 2.5 somewhat content would be a better description. Granted I have 33's on it with stock gears but even with 235/75's it was weak.
For those that compare the 2.5 to a 6cyl I will never understand how people think they are even close in power. (I own 3-4.0's now, and have had several in the past)
The gas mileage isn't much better for the lack of power and torque. Mine gets 15-17 with the set-up I have now, and my 88XJ with 275,000k gets the same. My 98 ZJ gets 18-20 with 31's wuth mixed highway driving.
I personally would not feel comfortable pulling any kind of load with it. I have tried and was disappointed.
However.......when the 2.5 is in 4low, it shines for me. That is where it really has impressed me. I almost like it as much as my 4.0's. To me that is the only saving grace because I use it as much off road as on road.
Just my .02
Let the flogging begin