[mcrews]

From AUTOWEEK april 5 2010 page 7.
"CLOSE THE SHUTTERS
the 2011 Chevrolet Cruze Eco debuting at New York auto show gets a 40mpg hwy rating based in part on a GM first: a lower front facia with shutters that automaticly close at 37mph (and reopen at 34mph) to improve hwy-speed aerodynamics and gain 2 mpg. The compact sedan goes into production this summer."

well there you have it......partial block grille worth 2mpg.
dang