Re: MPG or GPH
Like JohnB said, once you have a device that gives you realtime feedback it's amazing how the little things add up (such as tweaking the tabs and finding the optimal speed range, which may be different than the engines suggest).
With my boat the RPM's and MPH speed are pretty close to one another (except at the top range when I am going 57 MPH at 5,300 RPM's).
I have twin Yamaha 0X66's and average between 1.6 and 1.8 Mles per gallon when cruising. If I bump the engines to above 4,200 RPM's the engines purr like kittens but start to swill the gas. I would not have not known this if it weren't for the fuel mgmt. system.
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