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I have a 2000 250hp Yamaha ox66 EFI on 23'.
She was giving me 2.5MPG at around 30mph and 4000rpm.
I wanted to change out the filter so while I did that, I ran some Seafoam.
A 1/4 of the can in my oil tank and half of what was left into my old fuel filter. Ran that after I had warmed up my motor. Watched as she blew a white smoke cloud for a 10-15min. Repeated with what was left of the SeaFoam. Let it smoke for 20min. Pull up my anchor and ran her for a good thirty min up and down the river. I was seeing some unbelievable numbers.
Went away for a week and came back and was still a bit doubtful about the numbers. Went tot he boat last night and ran her for a good 30-45 mins. Here are some shots of the gauges...
This is at cruise...
You can see the Lowrance fuel gauge showing 4MPG, the Yammy tach at 4000rpm and on the top left corner you can see my gps speed, 28mpg . I was going against the Hudson current. Something kicked up my ducer so, no the depth isn't accurate.
Here's shot of her at WOT...
I'm doing better at WOT throttle than I did at cruise before I ran SeaFoam.
She was giving me 2.5MPG at around 30mph and 4000rpm.
I wanted to change out the filter so while I did that, I ran some Seafoam.
A 1/4 of the can in my oil tank and half of what was left into my old fuel filter. Ran that after I had warmed up my motor. Watched as she blew a white smoke cloud for a 10-15min. Repeated with what was left of the SeaFoam. Let it smoke for 20min. Pull up my anchor and ran her for a good thirty min up and down the river. I was seeing some unbelievable numbers.
Went away for a week and came back and was still a bit doubtful about the numbers. Went tot he boat last night and ran her for a good 30-45 mins. Here are some shots of the gauges...
This is at cruise...

You can see the Lowrance fuel gauge showing 4MPG, the Yammy tach at 4000rpm and on the top left corner you can see my gps speed, 28mpg . I was going against the Hudson current. Something kicked up my ducer so, no the depth isn't accurate.
Here's shot of her at WOT...

I'm doing better at WOT throttle than I did at cruise before I ran SeaFoam.



