Fuel is a problem for our trip. Not only is it hard to find and hard to buy, but even if we manage that, it is apparently pretty crappy quality once we get past Russia. 'RON' is the measure of octane, and in the UK we enjoy a bog standard of 95 RON - and 97 if you're prepared to pay a few extra pence for the priviledge. However, once we reach the sunny climbs of Kazakhstan, it falls to just 72, and down to 68 in Mongolia. Running our car on that will be like trying to get drunk on Kaliber. In stepped directcarparts, who kindly offered a shed load of octane booster - which will effectively give us additional RON. They've given us enough for 3,000 miles - which should help the final third of the journey - when things get bad. Its like a poor man's turbo, and should see us roar past 30mph to the finish. Nice one Simon.