wwest
Junior Member
Just replaced all the tires with the same ones that came with the Longhorn 2500 '21. The MPG dropped 2.5 with the new tires...why??? Exact same tires!!! Any thoughts what would make such a drastic reduction? I put 1000 miles on the tires, recorded mpg by hand and it matches the truck computer very close,and have done absolutely nothing different with the truck...crazy??