I presently have the KO3's in 315/70R17. Have had them since COVID, since the BFG's I had, 285/80R17's could not be found, literally, anywhere in North America at the time. I would not go down in size so the obvious option was to go big or go home!
Hence the KO3's 315/70R17 I now have.
They absolutely suck MORE gas! Even though I have my rig properly lifted, trimmed and aligned, I still get a wee bit of rubbing at lock to lock on what seems like the frame or control arms. It's not bad enough for me to have ever checked it out.
Note: you will need to at least move your caster forward when you go in for an alignment.
Other than that, they've been great tires, but... I will be going back down to the 285/80R17's when these are done.
Hope this helps.