GM has released a PR piece about aerodynamics. See here:
GM Commemorates 30 Years of Aerodynamic Progress -- WARREN, Mich., Aug. 4 /PRNewswire/ --
They list the aero mods on the Cruze ECO:
Quote:
- Segment-first active air shutters in the lower grille opening. When open, the air shutter provides additional cooling for the engine. When closed, the air shutter reduces wind drag.
- A front air dam, lower ride height, and underbody pans minimize underbody drag beneath the Cruze
- Tire blockers reduce the pressure build up in front of the tires and thus reduces drag
- A rear deck-lid spoiler increases the air pressure behind the Cruze Eco and reduces its CD
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