I went from all aluminum 24.5’s, and lopro tires, to the small super singles and matching height lopro 22.5 steers on my Western Star. Weighed it, drove 6 miles, changed wheels, drove back to the scales and reweighed and had dropped 450 lbs.
I did it for weight savings because everything we did we got paid by weight.
Made zero difference on fuel mileage, didn’t handle any different on the road (I went with the offset ones) but they were horrible on sloppy mud that about all the dairy’s had. Duals would cut in and let you get down to the hard base and keep going whereas the supers would try to float.
I liked them for what I did, but sure don’t think everyone needs to run them.
I got 130-135,000 miles out of Michelin XDN2’s doing what I did. Last 12 months I hauled feed I was loaded 82% of the time, grossing 84,000-90,000 lbs, drove 95,000 miles, and would typically run 22-25 loads a week so I was into and out of a lot of rail sidings, feed mills, and dairy’s. Lots of turning etc.