Druzhba, Urumqi, Turpan, Hami, Liuyuan (312 HWY)
Liuyuan, Aksay, Ige, Da Qaidam, Golmud (215 HWY)
Golmud, Amdo, Naghu, Lhasa (109 HWY)
Lhasa, Shigaze, Lhadze, Dingri (318 HWY)
After Dingri I turned left to Everest BC. There is about 100 kms offroad without labelling. I was there in July-August 2006. 312 HWY is very, very, very hot in summer (+52C in the daytime, +38C at night) Alt +1500 -60 m. 215 HWY is more comfortable (+35C in Aksay, +20C in Golmud) Alt 1000-3800m (2800m in Golmud). 109 HWY is one of highest and coldest road in the world. ( +15C -1C)
Alt 4700 - 5300m. In Lhasa 3800m +20C. 318 HWY is good-looking mountain road along Brahmaputra river. (+20C 0C) Alt 3800-5200m. Longest road section without fuel 280 km (Aksay - Da Qaidam). Petrol consumption is 8-12 l per 100km depend on altitude. I have a standard AT tank 23 l.