ELKHART LAKE, WI – With fuel economy showing up on even luxury-car buyers’ radar screen and government regulations ratcheting upward the world over, it’s no surprise Porsche AG engineers put as much focus on miles per gallon as performance in developing the new Panamera 4-door sedan. The German auto maker says it employed lightweight materials, advanced powertrain technology and a few aerodynamic tricks to wring out an extra 4.4 mpg (1.9 km/L) on the way to a rating of 16/24 mpg (14.6-9.8 ...

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