Just as a matter of fact, my 98 sailfish with 2004 f225's achieve 1.4 to 1.6 s mpg. I have 700 hours on them. I used to get 1.5 to 1.8 mpgs when they were newer. I have yamaha 3 blade 17' props which i had a prop shop add more cup. This helped my mpgs a little. Wide open rpm is 5700 to 5800 rpms.