Gas engines for the 2011 - 2015 model years:
LS - 1.8 L Non-Turbo Ecotec engine
LT, LTZ, 1.4Turbo Ecotec engine
ECO - same engine as the LT and LTZ but with aerodynamic tweaks, weight reductions (especially in the manual transmission version), and serious gearing changes. The ECO trims sit between the 1LT and 2LT when it comes to creature comforts.
RS is a body package option for the LT and LTZ trims.