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

Ford Focus

Good fuel economy and environmental cleanliness come via this 2.0-liter inline four-cylinder compact. A slightly less powerful variant of this engine achieves a PZEV rating in select green states. Both five-speed manual and four-speed automatic transmissions are available. Several body styles are offered, including a four-door sedan, three-door hatchback, five-door hatchback and wagon with base S, mid-level SE and top SES models; options include a power moonroof, leather seats, traction control and side-mounted airbags.

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Ford Focus