which tank quantity is correct?

[rick_od]

I have a '03 Sightseer. The manual that came with it says it has the following tank capacities: fuel 60gal, fresh 75gal, black 36gal, gray 46 gal. The window sticker says: fuel 75gal, fresh 75gal, main 41gal, aux 40gal. When I back flush, It takes alot longer to fill the gray. What gives...any ideas as to the correct quantities???