
Some of the world's best sporty sedans come with letter-and-number names. Ever tried to sort them out? 5-Series, E-Class, A6, and CTS, it's as if Webster's ran out of words. With the XF, Jaguar joins the ranks of the alphanumerics--and it's also joined this elite cadre, with a four-door marked by relaxed handling, a wealth of technology, and...
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