I would check out the BFG All terrains. I have a pair of mud terrains on my hunting truck because more often than not, ill be going through 2 foot of mud when i got to my turkey spot. The BFG's are a little more expensive but worth the buy. On the tires it says 70-80,000 miles. Right now i got about 3/4 teard left at about 40k. My Mud Terrains take down my gas mileage 3 gallons but the mud terrains are more agressive in the tread . I payed 500 to get them installed at the michelin place down here. Good luck to ya!
Kevin