Hi Don! Welcome to the board.
I think I know a little about T28B/C's, I'm a newbie, but I am obsesed with T28's. There are owners that hang around on the board who will correct me if I'm wrong.
1. 60 gallons an hour. Don't forget oil either. 12-14 gallons of it.
2. Depending on which manual you go by, it's either 1500 or 2000. No one I know goes by that though. Everyone I've talked to falls somewhere between 900-1200 hours, or they go by "2 or 3 cylinders in an annual and its time for a major."
3. A zeroed out engine is 40-50k. I would start there.
4. A no problem annual is around 5-6k. Also, dont forget the 5 year prop AD, 5-6k also.
5. What Glenn said. I have found that T28 guys, like almost all warbird guys, have a very deep knowledge of their aircraft and are able to tackle a lot of problems your average Cessna dude would not be able to, or in some cases, would never face. I'm not knocking Cessna dudes, I am one, but, in casual conversations with non-warbird folks, more often than not, if there is a problem on the ramp during the $100 burger weekend, they'll be finding another ride home and will have to wait until the shop reopens on monday. I've never personnaly had that happen in a warbird. That might be because most of the people I know are renters or owners of newer planes, and are loath to touch them. The guys who own older cessna's that I've met, seem to be just like the warbird guys though.
6. 500 hours PIC. When you get the type rating, it will probably say "DAY VFR ONLY" on it. You will also need complex and high performance endorsements also. You will probably want get and IFR rating too, good to have, and good for the insurance man.
7. Throw in Insurance, Taxes, and Parking. Your mileage will vary on those.
Insurance=Experience, type of flying, location, condition of the airplane, and hull or not.
Taxes= Depends on your, state, county, ect. In most places though, you will become a "Master of the Display Dates".
Parking= I would suggest a hangar. Besides the obvious, weather, birds, ect, The most beautiful thing about a hangar is, Drum roll please, Electricity. T28's are voracious users of electricity. Having a start cart on constant charge close to the airplane rocks. Being able to set up a heater to get everything enginey all nice and warm before a cold day start, rocks. Besides electricity, storage. Storage for the mountain of stuff that seems to magically accumulate near every warbird I've ever seen. Cases of oil, spare parts, oil, old parts, oil, tools, oil, parachutes, oil, tires, oil, nitrogen bottle, oil, air compressor,oil, tug, oil, cleaning gear, and oil. Plus, if you're in a managed hangar, there are invisible armies of helper bee's that clean up the ever expanding pool of oil under the plane everyday while you're away from your beloved airplane.
All of the owners I've talked to when asked how much does it cost, almost always says somewhere around 500 dollars an hour when it's all said and done. That could be less or more depending on if its a good annual year or a bad annual year, gas prices, and other variables.
I don't know about A's. I figure that they would be somewhere inbetween the two.
I have the same dream. I will be a T28 pilot one of these decades. I've been very lucky in that there is a lot of owners out there helping me. That is very cool. It must be my winning smile and sparkling personality.
Steve Patterson and Chuck Wahl post here now and again, they'll know the intimate details of T28 operation.
Good luck! Have fun!