Thanks for your answers, I just sailed the 81 miles (13 hrs) so I didn't have to worry about gas.
I did find out last season that at 2400 rpm or so (6 knts in my 32'ter) I'm using a little less than 1 gallon (more likely 3/4 gallon (2.85 liters)) per hour which was a lot less than my previous power boat with the twin V-8's with 4 barrel carburetors on them. Sailing is great again.
S/V "Sailmates" 1973 IRWIN 32 Classic
I want to live and sail forever, so far so good[/SIGPIC]