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Purchasing A New Car? Helpful Guide On Whether To Opt For Petrol, Diesel Or A CNG Car


Purchasing a vehicle is an important choice in one's life. With all the options to look from, it can become confusing. It is appropriate to invest in a vehicle that can offer you value with respect to your expenses.

Firstly, let us have a look at prevalent rates for petrol, diesel and CNG

Petrol price in Mumbai – Rs 77.5 per litre*

Diesel price in Mumbai – Rs 68.26 per litre*

CNG price in Mumbai – Rs 44.2 kg*

*As on August 22nd 2019. Also please note that fuel prices vary across cities.

The diesel variant of a car model is the most expensive one to purchase as compared to its petrol compatriot. It would cost approximately a couple of lakhs more than the petrol variant. CNG vehicles cost Rs 85,000-Rs 90,000 less than the petrol vehicles.


Secondly, let us look at which is the most appropriate car to purchase based on driving trends:

If one doesn’t drive frequently

If one’s car covers less than 500 kms in a month (less than 7000 kms in an year), it is advisable to purchase a petrol car.

If one drives regularly

If one is expected to cover around 1000 - 1200 kms in a month (About 12000 - 15000 kms in an year), CNG vehicles would be viable

For driving on the highways

If one’s vehicle covers more than 2000 kms in a single month which turns out to be more than 20,000 kms in an year, then a diesel variant would be most appropriate.


Thirdly, let us consider pros and cons of purchasing petrol, diesel and CNG vehicles:

Pros and cons of CNG cars


CNG cars are most cost efficient as compared to petrol or diesel variants

They are suitable for the environment as well

Thanks to retro fitted CNG, a vehicle can switch between petrol and CNG


Capacity of CNG cylinders is small (maximum of 12 kilos with usage of 85%)

The pickup is weak

A large proportion of boot space is taken by the CNG tank

Due to fewer refuelling stations, there are long queues to fill a CNG vehicle

Pros and cons of diesel cars


Running cost is low

As compared to petrol or CNG, diesel cars last longer

The pick-up is stronger thanks to fuel combustion


The upfront payment to purchase a diesel car is the highest as compared to petrol and CNG vehicle

Cost of spare parts as well as regular maintenance are expensive

Pros and cons of petrol cars


A petrol variant is cheaper than diesel and CNG variants

The engine doesn’t degrade as quickly as in the case of diesel or CNG variants

Since an alternate gas kit isn’t required, maintenance is lower


As written earlier, petrol is the most expensive fuel in the market today. Running cost of the vehicle turns out to be therefore higher

Torque is lower when it comes to engine performance.


On the basis of these three aspects which have been covered, one can figure out which would be best car to purchase.

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