I finally got a day to get out on the water after the re-power of my 1996 Gulfstream with a G2 300 (replacing the original carbureted Yamaha 250). I thought I'd share my numbers in case anyone is interested.
I did an 86 mile loop and burned 33 gallons for an average of 2.6. I could just barely get 1 mpg with the old motor.
The extra 50 hp makes a huge difference - it totally transforms the boat.
WOT 5400 does 45 mph at 24.5 gph - and there's room for improvement since the motor is way too low on the bracket. She's propped with an 18 pitch four-blade.
Flat water conditions with the curtains up:
RPM MPH GPH
5000 41 18.3
4500 36 14.2
4000 30 11.0
3500 23 8.6
I did an 86 mile loop and burned 33 gallons for an average of 2.6. I could just barely get 1 mpg with the old motor.
The extra 50 hp makes a huge difference - it totally transforms the boat.
WOT 5400 does 45 mph at 24.5 gph - and there's room for improvement since the motor is way too low on the bracket. She's propped with an 18 pitch four-blade.
Flat water conditions with the curtains up:
RPM MPH GPH
5000 41 18.3
4500 36 14.2
4000 30 11.0
3500 23 8.6
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