If you're not used to mud tires then you probably won't think they're quiet, but they are 'quieter'
As before, don't know anything about MTZ's. The only other tire I considered was Toyo M/T's My gas mileage went down for sure, but I also went up to 285's. I just did a tuneup and whatnot though, so gas mileage has already made a rebound. I WAS getting 16, this is the first full tank since the new plugs and filters, so we'll see, I'm expecting back up to 18 if it continues as it is now.
I've been running MTZ on the tacoma with 60,000k's on them in all kinds of conditions and highly recommend them. The tires have 1/4 tread left and I drive them hard on the mountain passes. Off road they conform really well aired down. Side biters work really well. The sipping really helps in the snow and ice on and off the road. Not bad in mud but better on the rocks and trails. I.ve driven them through a trail where it was freshly logged with really sharp branches and sharp trunks with no penetration in the sidewall. The MT/R's didn't fair as well. Hopefully BFG has improved their side-walls on the KM's cause that was their weekness. Little hum on the highway which is expected. They are as good as my Goodyear MT/R's on my 81 but with better road performance. Lots of guys run them down undah in the bush cause they're a tough tire.