Before revision: See definition of Bi-fuel Vehicle The most common available fuel in the market for bi-fuel cars is natural gas (CNG), and by 2008 there were 9,6 million natural gas vehicles, led by Pakistan (2.0 million), Argentina (1.7 million), and Brazil (1.6 million).
After revision: See definition of Bi-fuel Vehicle The most common available fuel in the market for bi-fuel cars is natural gas (CNG), and by 2008 there were 9.6 million natural gas vehicles, led by Pakistan (2.0 million), Argentina (1.7 million), and Brazil (1.6 million).