I'm running 285/70-17 KM2's and they are fine around town and also during my 40 mile, expressway driving to work and back. However, I recently took a couple of all day, 500 mile trips on the highway. The hum did get to me after a couple of hours. I put earplugs in.Mike
I am a bit concerned too. I mean, this time of year, I spend a lot of time off road, in the mud and hills. I will very much enjoy the increased capability, but for 8 months out of the year, 90% of my miles will come on the pavement.
I will try 40psi next time I have to do an all day run, the higher pressure should help. Off-road, I have the staun tire deflators that bring me down to 18 psi. Very nice grip in the FL sand and mud... I love the tire!