I'm on my 17th year of owning hull #27, a Tollycraft 57 wide body c/w a pair of 800 HP. 3408 Cats.
I agree with tiltrider with respect to the fuel consumption at speed values and you will likely soon realize that the boat operates most economically at 2 speeds. 9 knots burns about 7 gph, while 19 knots uses about 42 gph. Any speed above 12 knots is usually about the same gpm as 19 knots and is a waste of time.
My dislikes include:
The headroom in the E.R. at 5' is a pain at times.
House and start battery locations outboard of the engines is a poor choice. I relocated mine.
Main fuel tanks (500 Gal. each) and the blackwater tank are buried in the boat. Inspection and service access is non existent. Removal process starts with a chainsaw just to gain access.
Mine are original, and I dread the thought of replacement.
Lazarette hatch in the cockpit deck is subject to de-lamination due to water ingress. Same is true for the bowsprit.
Poor mechanical ventilation in the heads and galley.
No builder support, Tollycraft is long gone, now 25 years.
All that being said, I don't know of a boat in the same vintage and price range that I would rather own.
If you want more in depth information from me, PM me.