A turbo charged engine has much more potential.
Good point I don't want anyone to think they will be gaining 50% over stock on a gas engine. Turbo diesels are much more limited by emissions rather than engine strength therefore there is much more room for improvement. There is also almost no concern over detonation which is a major limiting factor in both NA and forced induction Gasoline engine tuning.
However Chrysler's tunes are very conservative and there is room for improvement especially in auto trans jeeps where torque management can be removed, custom tuning is a different story than canned superchips tunes. Just for reference I have attached a file with superchips claimed gains. Custom tunes will almost always gain more.
View attachment superchips gains.xls
By comparison many diesels can gain 150-300 HP over stock with just exhaust and tuning changes
That being said I plan on tuning for tire size correction and figure that since I burn premium a hotter tune won't hurt. I don't think you will save any money on fuel as the tunes that actually add power require 93 octane. Plus the cost of the tuner at the best it will be a break even situation after many years.
If you haven't already I think a gear swap will give you the most bang for your buck.
you will notice a greater difference in both power and economy.