Google has gas stations listed but I doubt it will be of much help. When I was there in May there was a time when 5 stations in the row haven't had gasoline or only had A-80. A-91 if you are lucky but engine would start pinning at anything above 1/4 throttle so it was most likely A-80 sold at premium.
Now the problem is largely in northern Uzbekistan until you get to Khiva and then on new road to Bukhara everywhere else to the south A-92/95 is widely available.
If you are entering from Beyneu carry jerry can and put the highest octane available. There is a gas station across the border in Uzbekistan about 80km from Beyneu where you can top off with A-80 but they were not happy to start a pump for anything less then 10L.
It would be also a good idea to carry fuel sock there and at Pamir hwy.
If you are entering via Shymkent/Tashkent border x-ing don't worry about it. Gaz in KZ widely available as long as you are along main road.
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