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The growing humanity concern about harmful effects of global warming in consequence of greenhouse gases (GHG) emission has been translated on CO₂ emission reduction targets for the next years in many countries. These targets and regulations for exhaust gas pollutants with local effects have led to the introduction of new vehicular technologies as gasoline direct injection or hybrid vehicles, for instance. New fuel developments, including alternative ones, have already been an important contribution. In the United States, up to 2016, all manufacturers shall accomplish with the average production target of 34.1 mpg, becoming 49.6 mpg in 2025. In Europe, the 2015 target is 130 g/km of CO₂ average emission by each manufacturer production and reduced for 95 g/km in 2020. Japan, China, India and other countries have their own limits defined for the next years too.