Mark,

No I haven't and won't for a couple of reasons. The first is that if I am going to go through the tremendous amount of work that it will take to put any diesel into my coach, I want to be as current in the technology as possible. The second is the constrants of space and weight to power issues with my coach. I am not wanting to diesel the coach just to be "dieseling it". I am looking at some specific attributes that the Duramax has that are not there with earlier engines or other brands.

If I can't get any answers to the questions I posed above, I will go with the 8.1L Vortec. It's an easier conversion. I am not quite sure why some relatively straight forward questions such as normal rpm at 65 mph are going unanswered.

Thank you for your interest,