my neighbor freind that i borrow thier JD 855 always have the thing in 4wd. I am always taking it out!! i have no idea why they run in 4wd all the time. when i go to turn in my "what ever is growing there" yard it tears it up. they mostly bushhog fields with it that are basically flat, not sure why its needed? They do use it for landscape biz maybe 10% of the time doing loader work. for that i can see the 4wd but the rest not sure why