Some GM cars meet their EPA ratings better than others. It can even vary within trim line and model year. Example on this board: Nick R's 2011 Cruze LT with the 1.4T/automatic got 32-33 mpg highway, while my Cruze Eco with the 1.4T/manual gets 43-44 mpg highway. Similar car, same engine, different trim line. 2011 automatic owners were always griping about not meeting EPA, while 2012+ automatics consistently meet/beat EPA thanks to a programming and gearing change. And the manuals did better than everybody else...