I've tried all the setting on mine with the exception of the "towing" setting. I like the 87 octane tune the best because it gives a little more power and it gives some better mpgs as well. The 91 tune gets some more power but it had a tendency to want to down shift sooner on uphills and hold the higher RPM longer for the upshift. One thing that you will REALLY like if you have larger tires is the speedo correction. All around I like mine especially since I got it used for about half of new. I leave mine on the 87 tune and sometimes change to the "mileage" setting to get that extra 1-2 mpg on long trips.
04 WJ V8 HO, 545rfe w/ shift kit, NP231HD w/ SS SYE, TW drive shafts, 4" RCX, 255/75/17 moabs, 55w HID projectors, Cherry Bomb Vortex muffler, Superchips, bored TB, HD Tie rod and Drag Link, IRO Steering Equalizer, Dual steering stabalizers, Homemade Sliders, 4 Hella FF75 55w HID Light bar...
“The corpse’s crimson bitter tears flow and mingle through the endless sand feeding the chaos in me and making me stronger”