A catalytic converter may be utilized to clean up exhaust gases released. Biofuels are also made use of in some automobiles to enhance octane, enhance emissions or simply as a choice to petroleum fuels. Ethanol is utilized famously as fuel in Brazil; it satisfies practically 20% of the vehicle gas requirement of the country. Electric vehicles and stream driven engines were created method before gas powered engines. Vapor powered engines can not run until the boiler pressure was available; furthermore they often tended to be extremely heavy so they never ever achieved mass popularity as a road car. Henry Ford struck the best strike in their appeal by mass producing gas powered engines at budget-friendly prices. These cars are moved by propulsive jets which are produced from rocket, turbojet or turbofan engines.