This isn't your father's gas-guzzling 450SEL. Mercedes-Benz has been promising a real fuel-efficient version of its E-Class sedan and the German automaker has finally delivered. The new E250 Bluetec diesel will get 45 miles per gallon on the highway, a good bit better than the 39 mpg highway MB said when the E250 BlueTEC concept sedan debuted at the 2009 New York Auto Show.
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