I put a set of Fortera Silent Armors on my FEH a couple of months ago to replace my mismatched, worn and LOUD Continentals. I haven't really noticed a mileage hit yet, but we're still on the winter formula gas, so it's too soon to tell for sure, but my mileage has been slowly increasing to what it was this time last year with the weather warming up. I don't see myself trying to get new tires any time soon, though.