I put Firestone Destinations (E-rated) on mine, they have been quiet and not hurt mpg at all, definitely improved the wobble-factor on my F-150 4x4 with Hawk mounted. I run 55 psi in back when I have the trailer hooked up (Ruger C416 carying lightweight gear, clothes, stove, camping accessories) and about 50 psi in front. Getting an honest 15.8 mpg on trips (last one was 12,000 miles over 7 weeks) but would be higher if I didn't have to suffer through the winds of the Great Plains going to and coming from the Great West... in the mountains I typically get 16.5 to 17.5 pulling the trailer. Cost was about $785 for four from the local Firestone dealer mounted & balanced (my Ford dealer wanted nearly $1200 for the set) on my stock 18" rims. So far so good, 30,000 miles on them already, and no uneven wear, but I rotate them every 5K miles or so.