overall average not including running in or random canal trips 0.83L per nautical mile. (measured) - probably nearer 0.86L /nm if I nail the throttle, but that would involve further confirmation.
My original comments were closer to the truth than you probably gave credit...
Ironic I'm still experimenting with an engine that is older than some of our forum members!
The thing with portable tanks- I'm running a triple setup!
it also strikes me that all this talk of fuel consumption & boat balance should probably be in another thread rather than hijacking Tony's cruise!