Actually, the XZL is an even better choice for a Michelin that sees alot of road use. I would know. As for tire speed and wear, here is what I have heard, from the engineers of the tires AT Michelin. (My dad is in the mining equipment business so he knows the Michelin people very well) Tire wear, not counting weight, is exponential to road speed. So if you drive at 30mph, your tire will wear at a rate of X, if you drive at 60 mph, your tire will wear at a rate much faster than 2X. So the higher the speed you go, the faster it will wear. This is coming straight from Michelin engineers. Plain and simple the faster you go, the faster it wears. I have 335 80 R20 XZLs on my 94 F350, and after 15,000 miles of driving, with a truck that weighs 8k empty, and was often towing a trailer, my tires are still in very good condition. I never run over 65 mph though, and yes it does hurt sometimes on long stretches of highway. But running 70 or 75 wouldnt get me there much faster anyway....I do agree 150% about them being a world of difference better than Swampers on the road. I had TSL for 7500 miles, and they were damn near half gone by the time I got the Michelins. XL, XML, or XZL, it doesnt matter, if you are running on the road, you wont be let down with a Michelin.
