So I did a 350 mile trip to see the family for thanksgiving and highway mpg I got about 19.5 for the whole trip with the new tires(Highway). Very happy with that! City has been sitting about 16.5 mpg. I kept the speed at or just above the 70 speed limit for 75% and the other 25% 80-85ish. At 70 the tires produced a low noticeable hum, at 80 there was no noticeable noise. On another note , I did start hearing a pulsing noise very very low noise. I was thinking it sounded like a digital noise, my wife finally heard it on the way home and she thought it sounded like a CD player spinning. Not sure what it is but I would like to find out. Maybe it is just the truck checking sensors while driving??