2010, at times replacing LPG stations. Operators of used vehicles have balked at the massive conversion cost (up to quadruple that of LPG in Thailand), especially given Thailand's strong ultra-competitive domestic LPG conversion industry and retail CNG fuel cost (one and a half times). Thailand had some 700,000 LPG-fueled vehicles and 300,000 CNG fueled, with 1,000 LPG stations and 600 CNG as of 2011. Demand has increased 26% over 2011 for CNG in Thailand. As of the end of 2012, Thailand has 1,014,000 LPG fueled vehicles, and consumed 606,000 tonnes in 2012 of LPG, while 483 stations serve up some 380,000 CNG vehicles., showing that LPG conversion continues to enjoy heavy favor over NGVs despite a massive government push for CNG. CNG vehicles are more likely to be bought factory installed, while LPG is likely to be an aftermarket conversion. LNG vehicles in Thailand are almost non-existent except for lorries. Malaysia In Malaysia, the use of compressed natural gas was originally introduced for taxicabs and airport limousines during the late-1990s, when new taxis were launched with NGV engines while taxicab operators were encouraged to send in existing taxis for full engine conversions, reducing their costs of operation. Any vehicle converted to use CNG is labelled with white rhombus "NGV" (Natural Gas Vehicle) tags, lending to the common use of "NGV" when referring to road vehicles with CNG engines. The practice of using CNG remained largely confined to taxicabs predominantly in the Klang Valley and Penang due to a lack of interest. No incentives were offered for those besides taxicab owners to use CNG engines. At the same time, government subsidies on petrol and diesel made conventional road vehicles cheaper to use in the eyes of the consumers. Petronas, Malaysia's state-owned oil company, also monopolizes the provision of CNG to road users. , Petronas only operates about 150 CNG refueling stations, most of which are concentrated in the Klang Valley. At the same time, another 50 was expected by the end of 2008. As fuel subsidies were gradually removed in Malaysia starting June 5, 2008, the subsequent 41% price hike on petrol and diesel led to a 500% increase in the number of new CNG tanks installed. National car maker Proton considered fitting its Waja, Saga and Persona models with CNG kits from Prins Autogassystemen by the end of 2008, while a local distributor of locally assembled Hyundai cars offers new