In this undated photo provided by General Motors Co., the 2011 Chevrolet Cruze, is shown. The Cruze, the most popular car in the U.S. last month, will come in a diesel version that could boost gas ... more 
In this undated photo provided by General Motors Co., the 2011 Chevrolet Cruze, is shown. The Cruze, the most popular car in the U.S. last month, will come in a diesel version that could boost gas mileage to around 50 mpg, two people briefed on General Motors Co. product plans said Monday, July 11, 2011. (AP Photo/General Motors Co.) less 
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Associated Press | Photo By General Motors Co.
Mon, Jul 11, 2011 3:12 PM EDT