I got FS591's on my steers. The passenger side started getting toe wear at about 75k miles. I put a used Michelin energy x-line on just that one and then got it aligned. Now running 2 different steer tires but they both look great so far. I was fortunate to be able to get a used Michelin in great condition with nearly the same tread left on it as the other FS 591. I'll run these hopefully another 50k and then likely just get new Michelin's next time. They are more expensive but I have never regretted getting a Michelin.