My Little Mercedees Vito has a 75L tank!
I thought it could do with some fuel as my ass was twitching a bit more than usual, i managed to get 75.5L in it for some 522Miles:clap
If you really want to know the capacity carry a gallon in a Jerry can and wait tiil she runs out.
Fill her till she can't take any more! OOH ERR!!
And then you will know! Assuming you can get a sufficient mortgage to fill it to the top!!