According to the latest figures from the Natural Gas Vehicle Knowledge Base, Iran, with the world’s second-largest natural gas reserves after Russia, in 2011 became the world leader in natural gas vehicles with some 2.9 million on the road, narrowly edging Pakistan, which is trailed by Argentina, Brazil and India, respectively.  Iran’s reliance on its cleaner fossil fuel seems unlikely to diminish as international sanctions continue to bear down on its nuclear program, which in turn have curbed imports of gasoline; though Iran has large oil reserves, its ability to refine its own gasoline falls well short of its needs.  But for ordinary Iranian motorists, natural gas is less a geopolitical or environmental issue than a pocketbook concern. “This sort of fuel is cheap, and it gets me home every day — that’s what I care about,” said Sasan Ahmadi, a 42-year-old office assistant filling up his Iranian-made Kia Pride at a natural-gas station for his hour commute home.

The government began promoting natural gas about a decade ago, and not just in response to American-led sanctions. A big initial reason was the increasingly thick yellow blankets of smog that often engulf greater Tehran and its 12 million inhabitants. That was a result of rising auto sales by domestic carmakers like Iran Khodro and Saipa, which took off as oil revenue began rising sharply around 15 years ago, enriching tens of millions of Iranians…..

As a means to counter outside economic pressure, natural gas’s usefulness is clear. Because of its inadequate investment in oil refineries, Iran has long been forced to refine a portion of its own crude at refineries in Europe to satisfy rising domestic demand for gasoline. So when the European Union in July barred gasoline sales to the country, natural gas helped to blunt the blow.

Despite the sanctions against Iran, motorists like Mr. Ahmadi can make their commute for the equivalent of less than a penny a mile using the alternative fuel at subsidized prices. Gasoline is more expensive, especially because government subsidies have been reduced, but it is still incredibly cheap by Western standards: less than $1 a gallon….

Excerpt, THOMAS ERDBRINK, Oil-Rich Iran, Natural Gas Turns Wheels, New York Times, Oct. 23, 2012