NGV vs PETROL?

NGV, commonly known as 'natural gas vehical' was introduced by the media via TV to all Malaysian folks although it was already used by the Public Tansport Service eg. taxi in Kuala Lumpur..
Last year, when I was at KL, I thought tht it was an oxygen tank leh -,-.. Can be used to save accident victims?
KL and Seberang Prai (Penang) were the two states where NGV was first introduced in our country..
Petronas provide the gas here.. www.ngvcnice.com
The gas is commonly known as methane ( CH4).. Chemistry or simply when u kept cow,goat,chicken and human wastes into an underground sylinder added with water, the gas will be produced..
Our vehical also produce less pollutants when we use NGV..
Ofcourse, to install the NGV stuffs into our car, we only need to spend about RM3k-5k..
But, in the long run, i think it is better lor.. save time and money,no need to buy RM2.7o / litre petrol..
*kam siah*