The Kia Optima has officially arrived. Before 2011, it had lurked in the shadows of better mid-size sedans, but a big redesign gave it plenty of punch, and panache. Since then it's been one of the more value-packed family four-doors. But the new Chevrolet Malibu is a great car, and so are the revamped Honda Accord and Ford Fusion. Can a big...
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