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

Hyundai Elantra

Redesigned in 2007, the Elantra gained power and fuel economy from its 2.0-liter four-cylinder powerplant. The PZEV-compliant engine yields 132 horsepower, with fuel economy of 28 city/ 36 highway mpg with either the standard five-speed manual or optional four-speed automatic. Non-PZEV models achieve the same fuel economy, but are propelled by four more horsepower. Base GLS, mid-grade SE and top Limited models comprise the lineup; all get six standard airbags (including side curtains).

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Hyundai Elantra