FULL MERCEDES E550 ARTICLE @ INSIDELINE.COM: .edmunds insideline do Drives FullTests articleId=147866?tid=edmunds.il.home.photopanel..1.* Here's the biggest difference between the 2010 Mercedes-Benz E550 and the 2009 Mercedes-Benz E550: The 2010 costs $5,400 less. Usually, we save mo...