About 1.4 gph at 5300 rpm ... going by info at this Nissa site ...
http://www.nissanmarine.com/tech_tal...s2003_4-18.pdf .
Now ... it does not matter if your boat is making headway or not, you will
use x gph at y rpm. And, if you run WOT for long periods, you will soon be
getting an exceptional 0 gph ... but at 0 rpm ... :-)


"Gammara2" wrote in message
...
just got a 9.9 big foot mercury engine for my 6800 lb catalina 27
sailboat. any
one have any idea on the fuel consumption at full out speed in mild
conditions-
1-2 ft waves? jim