...here's a better link with a little info about the ECO model:
Model Information - Online Ordering Guide
...says the ECO model is 1PB69.
...and this shows the VIN decode for 2011 GM vehicles, including the Cruze:
http://service.gm.com/dealerworld/vi...2011%20car.pdf
...looks like the 1.4L Turbo engine code is:
LUJ - ENGINE GAS, 4 CYL, L4, 1.4L, MFI, DOHC, TURBO HO, ALUM GME