Volvo’s downsized and partially electrified Drive-E powertrain has done a number on the 2015 S60 and V60. Both cars— including the sexy new wagon—have 25-mpg city and 37-mpg highway ratings from the EPA, the highest fuel economy figures of any Volvo ever sold in the U.S. The S60 and V60 T5 Drive-E, as front-wheel-drive base [...]