The main benefit of automatic transmissions is that they are simply easier to use.
Automatic transmissions are safer to drive. With both hands free to drive and handle the vehicle there can be no doubt that it is safer to drive a vehicle with an automatic transmission.
Generally speaking an automatic transmission will last longer than a manual transmission, if for no other reason than it eliminates the grinding of gears and the wear and tear on gears when shifting is done in an improper fashion. How many of you remember the first time you drove a manual transmission and either killed the motor because of improper clutch use or ground the gears by not having the rpm's at a proper level? Most hands should have gone up after that question.
There is less maintenance cost with an automatic transmission simply because of the points mentioned in #3 of this list. However, when maintenance is required the cost is usually higher and the cost of replacement is always higher for an automatic transmission.
Initially, Hyundai Elite i20 Magna comes with a petrol and diesel engine but a CNG kit can be fitted with the one which has petrol engine. You will have to sacrifice with power to get more fuel economy and if you convert a petrol car into a CNG car, you may loose the warranty on the car and resale value of CNG cars is lesser than petrol cars. It is always recommended to get the CNG kit fitted from the authorized service center so that you can avail the warranty services as well. Moreover, the performance will depend on how the car is driven and maintained.
Click here to find the nearest Hyundai service centre by selecting your city in the drop down list.
How much fuel goes into a car varies on a lot of factors. Now you haven't mentioned how many km did you drive post the low fuel warning light as that could also determine how much fuel goes into the car. Even though the manual says that the tank capacity is 45 litres, the amount can vary by a small margin, give or take 2 or 3 litres. Also filling fuel in the hot day or in the night also makes a difference considering fuel expands during the hot day and contracts when the temperature is cooler. All said and done, make sure you fuel up within 3 to 4 km after the low fuel indicator light pops up.