You don't have to buy a hybrid to go green – but it sure helps.

Mazda 3i

These four-door sedans combine an environmentally-friendly powertrain with a sport-tuned chassis. A 2.0-liter four-cylinder engine with 144 horsepower makes 28 city/35 highway mpg with the five-speed manual, 26/34 city/highway mpg with the four-speed automatic transmission. Partial Zero Emission Vehicle (PZEV) status is achieved at the cost of four horsepower, as non-PZEV models deliver 148 hp.

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Mazda 3