My '05 213 averages from 10 around town to 13+ on the highway. After some growing pains, and a bonehead inattention to a water leak when the rig was built, resulting in a soaked floor under the 'protective' plastic cover, our big baby has performed well. I love the Chevy chassis, and it's actually the first vehicle I've owned with 300 hp. I also dumped the heavy tv and rebuilt the box, and in the process of adding speakers to the stereo, had the good fortune to remove the cab headliner and with the liberal use of Great Stuff and silicone sealer, eliminated a LOT of rattles, as in other areas of the coach. It's not silent, but the silverware seems to take the edge off. The Four Winds versions are quite similar, but I cannot attest to the quality aside from the few posts I've seen from owners who seem to like theirs as well..