I guess roughly in 5 months if you drive 100km daily.

This one side of the grass, the other is is very different.

The 55 KG cylinder gets up to 9 KGs of Gas. If he is getting 2.2/Kilometer, this means he gets 225 Kilometers in one full cylinder ((Rs. 55/2.2) x 9), which is absurd. No can can do that. I doubt even Mehran cannot get 225 Kilometers in one cylinder.

Normal 1300cc cars get up to 160 Kilometers on highways in one cyliner. But lets assume Honda City will do 170.

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So Rs. 55/KG x 9 = 495 (or lets say 500 to round the figure).
500 Rupees of gas can get one up to 170 kilometers, therefore
500/170 = 2.99 or Rs 3/KM.
Lets call this X.
X = 3.

Next, saying that Petrol is 4.17/KM is also his own car's economy. Not Honda City in general. His car is doing 4.17 Kilometer. 4.17 Kilometer means about 17 Kilometer/L (people are getting 19 in local). My car last time did 22.8 Kilometers per liter. But lets say my car has some magical powers, lets assume most people will get 21 KPL on this car if you drive at 100 km/h.

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So 75.20/21 kpl = Rs. 3.5/KM.
Lets call this Y.
Y = 3.5

**This is basic arithmetic. Even a child from the second grade can make these calculations. ** No car makes 225 Kilometers in one cylinder?

Now, you're saving 0.5 Rupees per kilometer.

After 80,000 Kilometers, you'll have paid the price of a CNG kit that costs 40,000 rupees.

If I am to calculate this for my own car, it would go something like this:

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75.20 divided by 22.5 = 3.34.

Per kilometer is 3.34 (assuming the car does 170 on highways on CNG, I doubt that. MOST 1.3L cars do 160 max on CNG but lets go for 170).

So per kilometer saving is 0.34. And lets suppose the price of the kit is 35000 (although there are CNG kits that cost even up to 60,000 very nice ones, but anyway..)

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35,000 divided by 0.34 = 102941 Kilometers (at which the price of a 35,000 Kit is achived).

I drive 25 - 30 thousand kilometers a year. In my case, the price of the kit will be achived after 4 years.

Another VERY IMPORTANT point to notice is that if you drive carefully, Petrol costs less than CNG in local. People get up to 19KPL inside city (probably without AC) This is cheaper than CNG.

One more thing equally important is that even when you're running on CNG, you're also burning petrol everyday. Sometimes CNG finishes, the EFI cars always start on petrol etc. So we're not adding that at all.

People, make some calculations and research of your own too. Its not as difficult as it looks.

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