The average price of petrol in Hanoi is Rp 13,788.10/litre over the past month, costing you anywhere between Rp 620,465 and Rp 896,227 to fill up a car’s fuel tank.
From Avis you can rent a car from about Rp 17,098,694 per week on average.
Generally, for a better deal it’s recommended to book in a timely manner (to save up to 0%). Cheapflights recommends you book around 90 days prior to your deserved date. Booking as early as you can also increases the likelihood that you’ll get the ideal car.
Typically, how long you can rent a car for depends on the inventory of the supplier. For Hanoi however, it is certainly possible to rent a car for an entire month.