(http://media.il.edmunds-media.com/porsche/boxster/2013/ns/2013_porsche_boxster_actf34_ns_50812_196.jpg) The 2013 Porsche Boxster's new 2.7-liter direct-injection flat-six engine gets considerably better mileage — and is more powerful — than last year's 2.9-liter unit.
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