The BMW 3-Series may be the yardstick by which all sports sedans are judged today, but there's a new tape measure in town--the 2013 Cadillac ATS. Now that we've logged more than a thousand miles in all the different flavors of ATS four-doors--six-cylinders and fours, rear-drivers and all-wheel-drivers, manuals and automatics--we're convinced that...

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