Totally wrong Calculations
For a 1300cc car
55kg Cylinder Full in ISB is for 900/-
Max mileage to gain locally is 140/- / 900Rs gas
Km cost is = 6.42/-
Not adding the cost of fuel that a car eats everytime we start it, not adding the cost of fuel a car takes in the days it drinks the fuel due to air restriction on inlet.
10 Litre Petrol cost is 1030/-
Max mileage for a perfectly tuned EFI car w/out weight of CNG and air restriction is something around 13-13.5
Cost per km on fuel is 7.60/-
Avg mileage to gain is 135km / 1000Rs fuel
Difference 7.60-6.4 = 1.2 Rs
AVG usage / month is 3000Km
Cost on Gas= 19260/-
Cost on Petrol= 22800/-
Difference / month 22800-19260 = 3540/-
The calculations done in the ad are totally wrong, for even 1.5 Rs / km I wont like to take hassle of standing in lines and eventually getting 100Bar gas (half of which is air) and ruin the cars engine, carry a cylinder and ruin the trunk space, make my car eat more fuel due to air restrictions .
The CNG has now become a false economy, its just a feeling that you are saving fuel but actually its not, it is recommended not to go on car to buy eggs and bread, instead walk and park your car in one place in market and use LEG11 to shop. We the Pakistani,s have a dilemma that we park in-front of the shop to buy groceries.
Note: The fuel burned to get CNG is not added in above calculations.