Again me NOT being an engineer, I have to go with "seat of the pants" measure. It felt like the 6.7 Cummins was going to always outdo my 6.8 Ford. And that was with a much smaller doghouse to get in and around. Now with 2 slides in the living area, we would lose all the pass thru storage we have now. And that's pitiful compared to the storage on REDs. Apples and oranges. And just so you won't think I have the New Car (RV) fever, I'm having many reservations on spending $50k just to have a diesel and 36" of room in the living area. Not to mention losing 2' in length.