The average price of petrol in Changchun is ฿ 29.64/litre over the past month, costing you anywhere between ฿ 1,334 and ฿ 1,927 to fill up a car’s fuel tank.
The length of time you can book a car hire for is subject to the inventory of the supplier. When renting a vehicle from Changchun it should be possible to hire a car for a whole month if needed.