10 litre tank is all you need
fuel seems to be a doddle in Mongolia these days. Recently did a route from UB - Kharkhorin - Tsetserleg - Tosontsengel- Uliastay, - Altai - Hovd - Olgiy - Tsagaannuur Border and did it solely on my tiny 10 litre tank.
I carried a container with 3 litres reserve, but never got round to using it.
So 41 litres / 26 litres is pretty much overkill. I would not bother filling up more than 20 liters as you definately dont need more and the extra weight will slow you down.
I bought the same road atlas maximondo mentioned at the post office. Decent detail including locations of petrol, and information was surprisingly reliable. I relied on it for locatiobs of fuel and was not let down. when i get home, i may be able to scan some pages for people coming innfrom the west, but for those entering from the north and stopping in UB i recommend you buy one at the post office
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