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After a lunch of bruschetta, pizza, and gelato, which is an ironic way to fuel up for testing a German car, Mercedes-Benz product manager Bart Herring gets straight to boasting. "No one is better positioned to bring diesel models to the market," he says. "Diesel is very well suited to what people want." Even setting aside Herring's praise, the new 2013 Mercedes-Benz GLK250 BlueTec 4Matic is clearly something unique. Not only is it America's only diesel compact crossover, it also handily tops its segment in fuel economy.