I did all those routes and never needed extra fuel on my Transalp with AT tank.
The only times I ran out of fuel were:
1. In Reno (cause, sheer stupidity)
2. Iran (cause, sheer stupidity)
There's fuel everywhere. If you go off into the backwoods you can do the gerrycan thing.
The PanAm has fuel aplenty.
Look at it this way, one Africa Queens fuel tank is at least two months on the beach in Goa drinking and eating as much as you please. With change for extras.
Around the world 2000-2004, on a 1993 Honda Transalp