When receiving more advanced "type" training, it's wise to understand the experience of the person offering the training - what has that pilot flown? How many hours? If less than 100 hours turbine time themselves, they really have little standing to be training it in any detail.
For fuel capacity, for any GA 'plane I can think of, it is a type certificate data sheet requirement that the fuel capacity be placarded near the tank filler, and in the flight manual. 'May also be at the fuel selector. If that information is not there, the plane is not airworthy.
Don't always take as gospel what you are told, do some research (like asking here) to verify what you think you have learned!