Don't notice any difference on road. I work up a steep, curvy mtn road and love cornering at about 45 mph. Still able to do that with these on. Took me about 2 hours to install in the drive way without taking off wheels. You will need a 21 MM ratcheting box wrench though.
I avg about 17.0 if I stay out of the turbos and minimize driving around town. I weigh well over 6K lbs with my metalcloak skid system and bumper upgrade. My tires are 33 lbs each heavier than stock Goodyears. Your Dashboard | Fuelly
your speedo is going to be off if you do this, just and FYI. Yes you can calibrate using Forescan but do you want to do that each time you change tires?
I put MC on my Wildtrak, after twisting a fuel tank hanger strap in Moab, last year. I have wheeled it over big granite boulders and have had no issues. It was a little bit difficult to install solo, but I am old and weak now. I do recommend them!
I saw something in the Lite Bright you tube channel where they put a towel or something to tighten up the panels and stop the squeaking on theirl trip to the Arctic circle.
I found that stepping on the brake real forcefully, when starting, keeps that from happening. I had it happen a few times, last year, in my 21 Wildtrak.