The yamaha fuel flow guage is pretty damn accurate. I've tested mine 2-3 times now and each time it is within ~5%.
3.5 is stellar man. The best i've seen with mine, optimal conditions is 3.4 mpg. I run about 3900 RPM, 27 - 28 MPH usually 3.2 mpg. I can kick it up to 4100 RPM and get 30 - 31 mph but it takes me down to about 2.9 - 3.0 mpg.
Great match for the hull for sure.
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