Yes, that is it!
I just messured it, with a 60cm fuel line it needs 2cc to fill it up.
I did made a small manual about all the technical inspection tools we use. Regarding the EFRA we have to messure the fueltank up to the carburator and so I was wondering how much difference the length of the fuelline would make so I calculated it and did not find it that important.
By the way, if you can have 2cc extra it is not adviseable to place 60cm of tube, you can get sproblems due the higher resistance in the flow.