Have fun in Tajikistan!
It is important to know that the price of gasoline in different countries varies from time to time. The price in my answer is updated at November 2014.
The average price for 1 liter of gasoline in Tajikistan is 1.31 U.S. dollar.
The evaluation of average price per liter of gasoline in Tajikistan was published in globalpetrolprices.com. You can see how the price was assessed using the following link -See link
The average price of gasoline in the world is 1.25 U.S. dollar.
Gasoline price in Tajikistan is more expensive than the average price for gasoline in the world (0.06 U.S. dollar more).
Did you know that Venezuela has the world's cheapest gas, sold at government filling stations for 1 cent a liter?
Did you know that Norway has the world's most expensive gasoline, at 2.26 U.S. dollar per liter?
Maps and navigation apps for Tajikistan
Map of Tajikistan (Google Maps) - See link
Google Maps app for Android phones and tablets - Link
Google Maps app for iPhone and iPad - Link
Driving in Tajikistan using waze app for Android phones - Link
Driving in Tajikistan using waze app for iPhone - Link
SOURCES OF INFORMATION
IEA - International Energy Agency - link
Gasoline prices in globalpetrolprices.com - link
Gasoline and diesel usage and pricing - link
What determines the price of gasoline? and more FAQ - link