Just curious, how do most folks here determine fuel burn? Floscan?[/QUOTE]
I calculate only after a long trip of several days and after I know I have previously topped off the tanks and have confidence I have a good handle on how much fuel I've used. That number will include everything...genny time, idle time, etc.
My recent nunber was based on a summer long cruise up thru the Trent Severn, Georgian bay, etc totalling 327 engine hours and 607 gallons of fuel, and I calculated 1.85 gal per hour with my Lehman 120 which seems to coincide fairly well with what I have seen others post.
(I could be off a little bit but who really cares?)
It's not a "true" representation of what the main engine burns, but tells me what I'll use with the way I boat.