I'll defer to you on the Commanders, I just know my experience with the Navajos. I love flying them, don't get me wrong, but they're not really economical. Although having a JPI and running LOP would save a ton of fuel. The owners of the Navajo/Chieftains I flew were all ROP people. We burned 45-50 GPH block in the Chieftain. But we'd true out about 190 doing it.