Ike says 10 extra should do the trick.
I have 2 Sceptor gas and one Sceptor diesel, but the diesel has only had gas in it, so if Wes doesn't need it, we can use it.
I will only need one of my Sceptor gas cans, since I am trying to pick up this other flat one, so I have at least one for you if you need it.
check out their website, kind of a cool concept, maybe old hat..
http://www.expeditionone.biz/geri_main.htm
Just saw Martin's post...wow.. we are going to need to use all my cans, I won't need that much but will bring them for anyone that does.
Btw I have a brand new (unused) frontrunner 2 can mount set up that I can't use with my Sceptors (they don't fit).. I will sell it for 80.00, I paid 100.00
This is the actual manufacturer
https://www.rotopax.com/home.php
They make a sage green version for Europe, see the write up for the expo 2010 in the spring 2010 Overland Journal, there is a photo. There are 4 on the back of a jeep.
Apparently, US requires red only (?) for fuel and they make sage green for europe, they are selling the crap out of these for Europe. I am trying to get one, out the back door.