From Nissan press:
Again in 2011 Sentra is offered in six models – Sentra 2.0, 2.0 S, 2.0 SR, 2.0 SL and the performance-oriented Sentra SE-R and SE-R Spec V (please see separate 2011 Sentra SE-R press materials for information on these models). Sentra 2.0 models feature a standard 140-horsepower 2.0-liter 4-cylinder engine, 6-speed manual transmission or fuel-efficient Nissan Xtronic CVT (Continuously Variable Transmission). Each combines a stylish compact exterior with outstanding roominess and amenities, responsive, fun-to-drive performance and unexpected versatility.
Refinements to Sentra for 2011 include improved EPA estimated city fuel economy and the fine-tuning of option package equipment. New Sentra 2.0 packages include a SL Value Package, Visual Audio Package and SL Audio Package.
Other changes for 2011 include the addition of a SE-R style rear spoiler for 2.0 CVT, 2.0 S and 2.0 SL models. Anti-lock Braking System (ABS) with Electronic Brake force Distribution (EBD) is now standard on Sentra 2.0, and Vehicle Dynamic Control (VDC) and Traction Control System (TCS) have been added as standard equipment to the Sentra 2.0, 2.0 S and 2.0 SR.