12 kg cylinder costs about 1100 i think it gives you more mileage per kg as LPG is more powerful fuel ...it releases more energy when burn in equal wt of cng ....and second point is what is use of CNG if its not available or available at low pressure ................In defence lahore i see pumps with wait of about 1 hour to 2 hours to get refill.....With low pressure cylinder does not even fill and you have to drive on petrol.....Another point is some one mentioned on pakwheels that with bigger cylinder you get more mileage from single fill from LPG.....
Exrtact from a previous discussion on pakwheels
https://www.pakwheels.com/forums/cng/38372-lpg-cng
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<hr style="color: rgb(199, 226, 240); background-color: rgb(199, 226, 240);" size="1"> How does LPG compare with CNG?
Emissions CNG is environment-friendly. Emissions LPG is more environment-friendly.
from CNG are on the average 70% less than On average, emissions from LPG
those from either petrol or diesel. are 90% less than those from either
petrol or diesel.
Power CNG tends to run down gas carburetors, LPG powers vehicles exactly the
resulting in a power reduction of about 20% same as petrol or diesel and in some
on average over time. cases perform even better.
Filling time Long lines at CNG stations are a result of the LPG has a faster filling time than
much longer filling time the product requires. CNG and flows at the same rate at
petrol.
Conversion cost On average, imported CNG conversion kits Imported LPG conversion kits
and cylinders for automobiles range between including autotanksare ranged
Rs: 40,000 to 50,000. between
Rs 7,000 to 15,000.
Pressure At 200bar, CNG is a high pressure gas LPG has a pressure of8 bar, and is
therefore lot safer to use than CNG.
Station set-up CNG station equipment can cost anywhere LPG gas station equipment will cost
between 10 million (one Crore) to 15 million an average of between Rs. 3-4
(1.5 Crore). million.(30 to 40 Lacs).
Transportation CNG stations can only be set up in areas LPG is highly portable and Autogas
Which have access to piped natural gas. Stations can be set up anywhere
Within weeks.
Mileage A standard 1,000cc vehicle will travel A standard 1,000cc vehicle will
16.25km on each kg of CNG. travel 26km on each kg of LPG,
which is a well-reputed highway
fuel.