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.