91th or 95th petrol be appropriate for scooter. There isn't 92th petrol in Thailand. For cars newer than 2013 year is suitable gasoline E20.
How to refuel? You don't need to go anywhere! Go somewhere to pay is also not necessary! You should do the following: 1. Drive to the right gas station 2. Open the gas tank hatch 3. And without leaving the car, tell the tanker: - what gasoline to pour - how much FOR EXAMPLE: "Ninety one-full!"(91st-full) "Ninety five - four hundred baht!" (95y-400 baht) 4. To pay for a tanker of your order as well sitting in your cool car!