LTZ with the 6.0L Vortec and 8' box. Great engine; plenty of power. Sounds awesome. I am averaging 15 MPG in mixed driving (mostly highway) 6 speed automatic makes driving and towing easy. capacious cargo box. Very comfortable and plush interior. High quality materials instead of the hard plastics used in previous models. Were it up to her, my wife would be driving it instead of me.