Standard on all models is the 182-HP ECOTEC 2.4L 4-cylinder. It is best in class hwy fuel economy at 32 MPG and can go 600 miles between fill ups. For added performance and towing capability, the 1LT, 2LT AND LTZ can be upgraded to 264-HP 3.0L V6 engine. All models have a 1500/3500 towing except for the LS which is 1500. Six-speed automatic transmission, StabiliTrack, variable-assist power steering, tire pressure monitor, four-wheel anti-lock brakes, six air bags, OnStar, XM radio, multiflex rear seating and LATCH system are standard on all models. The premium Pioneer sound, USB Port for MP3 players and rearview camera system is standard on the 2LT and LTZ and available on the 1LT. Back up sensors and heated seats are standard on the LTZ and available on the 2LT. The audio system with navigation and 40 GB hard drive and rear seat entertainment system with dual-mounted DVD screens is not standard on any model but is available on the 2LT and LTZ.