28/42 mpg = 2011 Cruze Eco with 6-speed manual.
26/37 mpg = 2011 Cruze Eco with 6-speed automatic.
28/42 mpg = 2012 Cruse Eco with 6-speed manual.
28/39 mpg = 2012 Cruze Eco with 6-speed automatic.
...the bump-up in mpg occurs only for the Eco and LTZ with 6-speed automatic transmissions because their axle ratios have been reduced from 3.87:1 down to 3.53:1 for better (~+5%) milage.
...this new 3.53:1 axle is also optional on the 2LT with the 6-speed automatic transmission.
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