With my 5K truck I'm running at 42K. I think my Diplomat may have been geared a little different. I could pull the Baker grade into Vegas at 60 mph with my Diplomat and once topped it towing a Nissan Frontier at 70mph while racing my brother-in-law. I was also getting 9mpg towing on long trips.
I almost cried with this new coach, the first few grades I pulled. It will drop to about 48mph and climb a wall.....it just won't go any faster. This level of DP is just getting too heavy for the motors they use. The newer model of mine has another 3K in frame and floor tiles. This year, Tiffin offered the ISX in the Allegro Bus, the equivalent to the Dutch Star. Newmar needs to follow suit.
