Editing Compressed natural gas (section)

=== Motor vehicles ===
[[File:Posto GNV 01 2009 485 CWB.jpg|thumb|CNG pumps at a Brazilian fueling station]]
{{Main|Natural gas vehicle}}
Worldwide, there were 14.8 million natural gas vehicles (NGVs) by 2011, with the largest numbers in [[Iran]] (4.07 million),<ref>{{Cite web |url=http://www.ngvjournal.com/?page_id=22218 |title=Worldwide NGV statistics |website=ngvjournal.com |access-date=2020-08-31 |archive-date=2021-04-14 |archive-url=https://web.archive.org/web/20210414094801/http://www.ngvjournal.com/?page_id=22218 |url-status=live }}</ref> [[Pakistan]] (2.85 million), [[Argentina]] (2.07 million), [[Brazil]] (1.7 million) and [[India]] (1.1 million),<ref name="ngvc.org">{{Cite web|url=http://www.ngvc.org/about_ngv/index.html|title=Facts about Natural Gas Vehicles|website=Ngvc.org|access-date=2016-07-17|archive-date=2014-03-28|archive-url=https://web.archive.org/web/20140328210057/http://www.ngvc.org/about_ngv/index.html|url-status=live}}</ref> with the Asia-Pacific region leading with 5.7 million NGVs, followed by Latin America with almost four million vehicles.<ref name=IANGV />

Several car and vehicle manufacturers, such as [[Fiat]], [[Opel]]/[[General Motors]], [[Peugeot]], [[Volkswagen]], [[Toyota]], [[Honda]], [[Maruti Suzuki]], [[Hyundai Motor Company|Hyundai]], [[Tata Motors]], and others, sell bi-fuel cars.In 1995, The [[Supreme Court of India]] decided that cars put into circulation after 1995 would have to run on unleaded fuel. At the beginning of 2005, 10,300 CNG busses and 20,000 CNG cars ran on Delhi’s roads.<ref>{{cite web | url=http://www.product-life.org/en/archive/cng-delhi | title=CNG Delhi – the world's cleanest public bus system running on CNG }}</ref> In 2006 [[Fiat Siena |Fiat Siena Tetrafuel]] was introduced in the Brazilian market, equipped with a 1.4-litre FIRE engine that runs on E100, E25 (Standard Brazilian Gasoline), Ethanol, and CNG.

Any existing petrol vehicle can be converted to a dual-fuel petrol/CNG vehicle. Authorized shops can do the retrofitting, which involves installing a CNG cylinder, plumbing, a CNG injection system, and electronics. The cost of installing a CNG conversion kit<ref>{{Cite web |url=http://weberautomotive.com/north-olmsted-cng-conversion-gmc-sierra/ |title=2003 GMC K1500 Sierra CNG Conversion in North Olmsted |website=Weberautomotive.com |date=2013-10-01 |access-date=2016-07-17 |archive-url=https://web.archive.org/web/20160323142059/http://weberautomotive.com/north-olmsted-cng-conversion-gmc-sierra/ |archive-date=2016-03-23 |url-status=dead }}</ref> can often reach $8,000 on passenger cars and light trucks, and is usually reserved for vehicles that travel many miles each year. CNG costs about 50% less than petrol, and emits up to 90% fewer emissions than petrol.<ref>{{Cite web|url=http://www.gas-south.com/business/compressed-natural-gas.aspx|title=Gas South: Compressed Natural Gas|website=www.gas-south.com|access-date=2016-03-31|archive-date=2019-12-21|archive-url=https://web.archive.org/web/20191221150906/https://www.gas-south.com/business/compressed-natural-gas.aspx|url-status=live}}</ref>