Mercedes continues to bring diesel engines to popular cars with the all new E320 CDI. Russ DeVault of the Atlanta Journal-Constitution takes the new $50,000 four-door through its paces and discovers diesels aren't as annoying as previous generations. Plus the new CDI version of the E320 gets better mileage (27/37 vs. 19/27!) and a lot better performance than the gasoline version.

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