deere came out with their four point hitch to get around Fergusons patent until it ran out. the fast hitch system was great up to four bottom sized implements after that not so good. They got sloppy in a hurry with big implements.
at rated load a 806 gas only uses around 1.5 gallons an hour more than the diesel. where a diesel really shines is at a light or part load then the economy is much more than a gas tractor. I'm the same as sparky i would rather have one 706 than 10 656 tractors.