Our Trail Lite 213 w/ 6 liter Chevy has a best mpg of 12 and an avg of somewhere under 11, mostly flat at freeway speeds of 70. Will try to get you our mpg figure from recent 300 mi return from Destin on a tank of mid octane.
TrueLarry, our TL is 3.5 yrs old, 27,500 mi., and except for two alignments and a GM factory seatbelt recall, has not been back for dealer repair. I can do simple stuff, but any major electrical or mechanical issue would send me to dealer. So, I guess you can say we have had a very reliable rig from R-Vision.
Some of my earliest complaints were of overhead rattling. With removal of the big TV, using radio more, and just growing familiar to the rig over time, the rattling is no longer on my radar. My sense is that TL put together some pretty good rigs, and other B+ posts of the past also bear this out.