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Providing your fuel flow sensor is reading correctly, then those numbers are not that bad at all. Those numbers are actually pretty close to what I burn in my HYDRA-SPORTS, and it's only a 20 footer(but it's a HEAVY 20 footer). Your WOT is a little high, but not horrible. I would have expected to have seen 21-23 GPH at WOT as my 225 that is putting out a bit more than 225 at the prop is burning about 27 GPH at hammer time. I hate to tell you this but you won't see a big improvement in those numbers with a FICHT or ETEC at the cruise speed. Trolling will improve greatly and the WOT will come down, but at cruise I would only expect to see a 15-20% improvement over those numbers. The only upside to going to a modern engine would be you could go to a bigger HP and keep your fuel burn where you are or a touch lower at cruise.
The SUZUKI's are good engines, and are actually really good on fuel for there HP. They do have corrsion problems though in the lower unit and internally to the powerhead if they aren't flushed religously.
well i finally got the boat out today and was able to see how my newly installed fuel flow sensor worked.. had me, wife and the 2 kids on the boat. 50 gallons of fuel in the boat and almost calm flat river conditions
the ol 200 johnson ocean pro was using 2 GPH at idle in neutral
cruising at 4000RPM produced 28.6 MPH using 11.4 GPH
cruising at 4500RPM produced 33.7 MPH using 14.2 GPH
trolling at 1800RPM produced 6.51 MPH using 3.4 GPH
and drumroll....wideopen trimmed up at 5800RPM produced 44.4 MPH using 24.5 GPH (OUCH)
and i also checked the cavitation plate running wideopen and the engine trimmed in the middle and i could see it just below the water line, so i think the engine is mounted properly..
whatca think ferm??