Another tire to consider in the 18" is the Firestone Transforce AT load range E 275/70 18r. I am now on my 2nd set, as the first set went 67,000 miles with no issues and I still had a safe amount of tread left on the tires when I put the new ones on. I tow a 20ft trailer with my truck and I have traveled across the US in snow, ice, rain, sand, hard-packed dirt, potholed and hot paved roads. They are a quiet tire for the more aggressive tread, you can also order them in a street tread design. I can't compare fuel mileage with them as I installed the tires on my truck immediately after purchasing it - 2011 Chevrolet 2500HD Duramax, 4x4.
I rotate the tires every 10,000 miles and all 4 tires had even wear across the tread. I felt confident on the ice packed highways in Montana and both North & South Dakotas during the winter months. I even pulled 3 people out of ditches and medians during my travels and my truck never fishtailed or felt out of control at any time. The tires cost me $1050 otd, which is much cheaper than the Michelins.