Love mine, great highway and city economy, Towing is actually better than my 14 Sierra 6 speed. And with all the extras the models come with the awd, 4hi, and 4lo work awesome. Of and Yes they are available in the entire market. NOT ONLY CALIFORNIA, like the other guys said. The start stop is flawless, The 4cyl,8cyl modes also work great . I live in Alberta beside THE ROCKIES, so our roads are no where near flat. so the hybrid and 4cyl mode keeps your cruise engaged longer before the 8cyl kicks in. The only minor issue i would have liked seing available is the gear ratios being a little stiffer. But get up and go is good, ride is nice, and long journeys not to bad with the seating.. It also helped that GM put in a few extras on these models , BOSE stereo, locking diff's, Power seats, and power moon roof. (in the canadian models anyways) . Love my Truck....