Hi - My wife and I are planning to do some long distance cruising, FL to ME next summer, and possibly the Great Loop in a year or so, in a 2005 Sundancer 390 with 380 hp Cummins QSB 5.9 diesels with V drives. I'm having a lot of difficulty finding gallons per hour and gallons per mile data at various rpms and cruising speeds for the 390 with Cummins diesels. Finding a lot of info on the gas engines, but none on the diesels. Can anyone point me in the right direction, or provide any anecdotal info? Thanks.