The Honda Civic has been a green-technology leader from the start. The first-generation Civic, introduced in 1975, featured an inventive Compound Vortex Controlled Combustion four-cylinder engine that allowed it to meet Clean Air Act emissions standards — quite stringent for the time — without a catalytic converter. It was the only vehicle to do so.
In the city, when the Civic Hybrid is able to operate strictly on the electric motor, the three-stage i-VTEC system shuts down the gasoline engine and stops opening the intake and exhaust valves, resulting in reduced drag on the hybrid powertrain.
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