Hi, I was towing this weekend and thought about something related to this thread and wondered what the forum thought. First, I tow in Colorado mountains and probably one of the most grueling passes is the pass along I70 that goes through Eisenhower tunnel down into Silverthorne/Summit County from Loveland Ski area. I find myself wondering if the manual shift mode or locking out gears is preferred to folks when braking downhill. The previous comment about tow mode and letting it work, doesn't work for me at the speeds and sharp turns that are on this route. I put it in tow mode and found the engine working to slow down for too long at times, probably just my preference but I left it in that mode. I have to intervene and worry about heating my brakes up to much. My TT is a 27 ft weighing in around 7500 lbs loaded. I generally would use the Manual mode other times but I was locking out gears this weekend and it seemed to work well. I think I was even more aggressive about keeping the RPM's in the 3-4K range going up the hill as it seems to be not feeling bogged down at those RPMs when climbing. What do people find themselves most often using when braking downhill? Average MPG out from Denver was 7.3... total average after coming back was 9 something. We camped near Leadville at twin lakes, beautiful spot