John-I was at OSH for a couple of days last week and looked for my 200 brethren, but did not dig too hard. Tell Ross hello. F 35’s and F 18’s were awesome!!
I own 196M, which is a 1964 C model. It has a IO 520 factory remain installed Jan 2017 with GAMI’s. I do not do a lot of long distance cross country so I rarely climb above 5K and typically do not worry about LOP. So at 23/23, I am burning about 15.5 GPH at about 1400′ EGT depending upon density altitude. I know that is not the most efficient, but it works for my 30-60 minute legs for now. Still air is 155-160 knots.
I will tell you that a 200 is perfect 2 person, full fuel and luggage traveling machine. You are smart to be evaluating and repairs have been easily accomplished as most things are off the shelf.
Good luck with your search.
Best-
Ed P.