RE: looking for a californian
I have the twin 85HP Perkins. I burn about 3.5 gph at 8 kts, which is my cruise speed (2400 RPM). WOT is 10 Kts (2800 RPM).
It's a little better than 2 MPG...with 250 gals on board, that's 500 miles with reserve. LRC!!