Save money by driving a CNG vehicle. One of the key reasons to buy a CNG car is the cost savings. Here is a little calculator that will estimate your cost savings in a typical year in driving a CNG car vs. a regular petrol/diesel car. Fill in the values with your numbers and click on "Calculate Savings" to estimate your Annual Savings. Shift to CNG Form Area Form Input Select Location- Select -BareillyUnnaoKanpurJhansi Vehicle Type- Select -AutoTaxi / CarLCVBus / Truck Fuel Type Petrol Diesel Mileage Monthly Running CNG Required : KG Total Cost of CNG Rs.: Total Saving Per Month Rs.: