I have 1/4" wheel spacers on there also. They are surprisingly quite but not completely. there is some hum when going down the highway but its not over powering. The magnaflow and radio drowned it out pretty good. Even with the wheel spacer there still is some rub at full lock not a huge deal but i would like there to be no rub so maybe bigger spacers? it is also 2wd so idk if that plays a big part of rub or not. also yes there is a noticeable difference in milage, which should be expected, they are heavy tires but its not enough of a difference to make me immediately switch back to stocker size. MDS still kicks in occasionally so im ok with that. If it never kicked in i might MIGHT think about going back lol
Hope i answered your question!