A properly siped tire will actually increase it's life. There is a chance of some slight chunking off of some treads, so the outer treads on both edges of the tire should be avoided.

Also surprised the Toyo MTs haven't been brought up.

i have the km2 quiet on road and works great off. had the procomp x terrain very loud on road as tread wore down and lasted about 22,000 miles
my next tire would probably be toyos open country mud or km2s

I'll 3rd or 4th the KM2's. They are very well behaved on the road; with one exception and that is in the winter. They are a bit on the margnal side on ice and packed snow. I had mine siped and it made a huge differnce. Next set I'm going to do myself as I think I can do a much, much better job than the machine the tire shop used.

If you are on a budget, like I was, the Hankook Dynapro M/T is great on the highway and off road. I know them well, I have owned 2 sets of these. If money isn't an issue, go with the KM2, they are a nice tire but $$$$$$$$...

http://my.project-jk.com/data/500/tire32.jpg

MTZs are great onroad and offroad. :D

Lots of rain, snow and ice where I live. I've found the best bang for the buck to be the Super Swamper TrXus MT. They are a true mud tire that has street manners like an all terrain. Quiet on the road, good siping so they're great on the ice and wide deep lugs are excellent in the mud and on the rocks.

Here's the company link http://intercotire.com/tires.php?id=11&g=1

I have been real happy with my Cooper Discoverer S/T's both on and off road. On road they are not too loud, have good siping and handle wet and sloppy roads very well, off-road they are still aggressive enough to give good traction and clean out fairly easily. I have found them to be a great compromise for a daily driver that still sees quite a bit of trail time.

http://i170.photobucket.com/albums/u...s/March080.jpg
http://i170.photobucket.com/albums/u...8/DSC00714.jpg

pbungar, have you thought of this from a different perspective? Instead of an M/T with good road manners, why not an A/T with decent mud capability? I mean, are you going to be in the mud more than you will actually be on pavement? I have recently been looking at the Pro Comp Extreme A/T. Seems like it has good ratings all around. It will probably out last any M/T with proper rotation, and have better road manners doing it. It's just a thought.

I have Mickey Thompson MTZ's Love em off and on road my jeep is my dd also. By looking at them you would never think there good on road but they are :thumbsup::thumbsup::thumbsup:

I'm extremely happy with the Pro Comp Xtreme Mud Terrains.