(http://media.il.edmunds-media.com/cadillac/ats/2013/ns/2013_cadillac_ats_actr34_ns_92512_196.jpg) The 2013 Cadillac ATS with the new turbocharged 2.0-liter four-cylinder engine returns 21 mpg in city driving and 31 mpg on the highway, said General Motors on Tuesday.
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