Here is a screen shot from www.fueleconomy.gov
Looks like the 3.6L Impala is a little better than expected but the eAssists came up a mile or so short on the highway MPG. Good to see the bump on the 2012 Cruze confirmed.
GMI staff, can anyone confirm or deny the accuracy of these?
Considering a first gen LaCrosse (W-body with near identical weight to Impala) with the four speed and 3.6L was rated (using 2008 standards) at 17/25, the Impala numbers are pretty good.