1993 Grady 255 Sailfish-200 optis-1.7nmpg

[amr72]

That's what I'm getting. Sound right to you guys or should I be expecting more? 2 guys 150 gallons of fuel. 27kt cruise, 42kt top end. 5500 rpm at WOT. Opinions...

 

[gw204]

Is that all the time, or just at cruise...and in what conditions?

I just about get that with my 225 OX66s...cruise/flat water.

 

[amr72]

Average

1.7 is my average. I don't have the flowscan hooked up to a gps, so it doesn't give me mpg. What I have been doing is taking total fuel burn from the flowscan and total nautical miles traveled from the GPS for each trip and calculating that way. For example at cruise, 3500 rpms 26kts burning about 16gph combined. 4000 rpms 30 kts 20gph combined. At trolling speed 7kts 4gph combined. I was just wondering if this sounded right or if I should play with the trim to try and get better mileage. I was expecting more like 1.9 nmpg instead of the 1.7 so I'm not that far off, but still I would like to optimize (no pun intended) my performance.

Thanks.
Anthony

 

[Grog]

It sounds decent, 1.7nmpg is almost 1.9 mpg. Are you only counting the speed on plane or total traveled miles? As you go above idle and until you get on plane the MPG stinks and will kill the average. You might be able to tweak a little more mpg (especially at 4000) and top end with tweaks but not too much. What were you expecting?

I was getting just under 1.6 nmpg (26 Knots) last weekend with 170G fuel, and 7 people in bay chop.

 

[amr72]

total

I am using total traveled miles. For example, last trip 141 nautical miles traveled as per GPS and 85 gallons used. That comes to 1.66 npmg. I don't know if that's the right way to figure it out. I guess I wasn't expecting too much more, maybe 1.8-1.9. It's just that my set up is pretty unique so I don't have anything to compare to.