If you are referring to the Yamaha Fuel Management System the burn per hour may be off some because (the way it was explained to me) the fuel pump isn't constantly working and pulling fuel. That will cause a '0' reading on the gauge. I have one on my boat and have found this to be true (only at idle on my boat), the gauge fluctuates in it's GPH reading, but the total burned is accurate. I may be wrong in the explaination as to why, but I do know the total fuel used IS accurate. When I am running I do get a steady GPH reading. After having this, I wouldn't do without one on my boat.
Sometimes Nick I wonder if we are going to make it back myself Gauge looks low but we never got stuck Yet Unc
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