There are two types of car rental companies in Nepal. If you rent a car directly at Kathmandu airport, you can do it from international companies. In this case, both payment and conditions will be standard, with insurance and other nuances of the rental agreement. In the capital and other cities of Nepal, local companies provide car rentals.
Such rental companies are not very reliable, and their equipment often leaves much to be desired, so you should inspect it carefully. Local firms prefer to provide a car with a driver. Given the level of road quality in the country, this is quite an important measure.
The average price of car rental in Nepal ranges from 2000 to 7000 NPR per trip. But this price is valid only if you agree to the services of a driver of the rental company. If you prefer to drive the car yourself, the rental price may increase several times.
Traffic rules in Nepal are not particularly observed, and locals do not drive too carefully. This is not counting the animals, which at any moment come out on the road. Speed limits in Nepal are observed more due to the poor quality of roads than attention to the rules. But before driving on local roads it is worth consulting about fines for traffic rules in Nepal and other nuances of local driving.
To drive in Nepal you need an international license. But you can drive with them only for 15 days. Later you will need to get a local license. An international driving license is also required to drive motorcycles.
The cost of a liter of gasoline in Nepal is 0.95 USD. You can find out the current cost of gasoline in Nepal just before your trip on the website.
Renting motorcycles and bicycles is much more popular in Nepal than renting a car. Although it is still not a good idea to ride without experience on local roads. A motorcycle will cost you 4000 NPR per day and a bicycle 40-150 NPR per day.