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The C&D CoD report is for the ECO trims. The Gen 1 ECO actually changes shape relative to air flow above 40 MPH by closing off the lower grill. While not changing the frontal area this technique reduces the CoD enough to actually make the unmodified ECO MT the fastest of the Gen 1 gas Cruze trims and is one of the three external changes to the ECO that enable the car's 42+ MPG on the highway. The other two items are a lowered ride height, which is shared with the RS appearance package, and the laminar under-body panels which reduce drag by preventing turbulence.
 
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