Around Mid-North Ontario, I put it in 5th even with my little 8500# bumper pull. There are just too many hills, and when in cruise the downshift to 5th is late and noisy. If I do it manually before the hill, it's fine but that gets tiring fast.
The 3.42 rear works well in 6th when unloaded, even locally in these hills using cruise, and prolly is there for better mileage when unloaded. There's a lot of folks using these things as commuters.
Interesting point about lower exhaust temperatures when running in 5th running at higher rpms, versus using more boost in 6th. Hadn't thought of that. On the positive side, higher exhaust temps because of boost should decrease the need for active regen.
And expect that 6th in cruise might work ok down in the Florida flatlands. We'll see.
