cleanest emissions vehicles
The Civic GX is powered by compressed natural gasâmethaneâthe simplest and cleanest-burning hydrocarbon available. With an economical 113-hp, 1.8-Liter engine, the EPA has called the Civic the âworldâs cleanest internal-combustion vehicleâ with 90% cleaner emissions than the average gasoline-powered car on the road in 2004. And get this: in Utah, natural gas can be purchased for $0.63 per gallon.