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The rising demand for cleaner vehicles considering the upcoming stringent emission norms like Euro-IV has promoted development of CNG vehicles. The need for expensive after treatment technologies has imposed constraints on Euro-IV Gasoline and Diesel engine development. On the contrary CNG engines have easily met Euro-III norms with Carburetion technology and Euro-IV and beyond norms with Injection technology. CNG has proved to be a clean and environmentally friendly fuel, significantly improving the ambient air quality of cities. The addition of Hydrogen to CNG has potential to even lower the CNG emissions and is considered to be the first step towards promotion of a Hydrogen economy. Worldwide experts have described Hydrogen as the cleanliest fuel for IC Engines [1, 2 and 3]. Hythane is the patented blend of 15% of Hydrogen in CNG by Energy content. HCNG is the blend of Hydrogen and CNG in varying proportions.

Environmental degradation is on the rise due to the increased motor vehicle population. One of the strategies adopted to curb deteriorating environmental quality is the use of alternative fuels like Ethanol, Compressed natural gas and Liquefied Petroleum Gas. Natural gas is the world's most plentiful combustible fuel, abundantly available in all the continents. This naturally occurring fuel requires little or no treatment prior to use as compared to liquid petroleum products. Natural gas is also the lowest costing fuel. The use of CNG as an automotive-fuel results in significant reduction in the level of vehicular pollutants CO, HC, NOx, SOx, Pb and PM [1, 2, 3 and 4]. Additionally, the use of CNG results in reduction in the emissions of greenhouse gases (CO2), owing to the lower Carbon-to-Hydrogen ratio of the methane (CH4), as compared to other hydrocarbon fuels [5, 6 and 7].