Thanks for that, very interesting.
Our fuel situation is still a bit up in the air. As it happens, I'm glad we haven't contracted anyone to build/install any tanks of any description, as the company who were supplying the aircraft for this charity venture, free of charge, have now told us that we cannot have the aircraft until the day before the flight. Previous understanding was that we would have it well in advance, so that we might do promotional stops at airshows etc, not to mention the obvious preparation that would be required prior to leaving.
It now seems obtaining fuel in Russia is the biggest problem we have. It's so big, in fact, with such enormous expense involved in purchasing avgas from obviously financially corrupt agents in Russia, that we are on the verge of binning the round-the-world idea and going to Australia and back instead, without crossing to the States.