The average gas price in Nanjing is 22,837₫/liter over the past month, costing you anywhere between 1,027,682₫ and 1,484,430₫ to fill up a car’s gas tank.
The length of time you can book a rental for is subject to the inventory of the supplier. When renting a vehicle from Nanjing it should be possible to rent a car for a whole month if needed.