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I use my gps, this took some testing and I know when within .5 mile of when I'm going to run out. I do have 2 6g tanks. I would get a 2-3 gallon portable tank and restart my gps trip log then run till empty. Divide the distance went by gallons and then you know how far you can go. I did my testing at WOT so any bit I back off for cruise is + on millage and the + is safety factor (not used in trip planning). You are going to need to either pump or run the internal tank dry so you can find out exactly what it holds if you can not find out any other way. This is so you can determine how far your boat will go on a full tank.

The stick works fine like Kreepa said. Flo scans are nice since once calibrated you know how pretty much exactly fuel you have used, but just knowing how much fuel you have used is not enough. Boat fuel gauges are not the best in my opinion because you really need to have the tank level to get accurate reading. Again, if you have not measured the distance traveled what good is it.

I think the 10% rule is for a 60HP and the % goes down as HP goes up. Search fuel mileage on this forum and you find a formula that should get you very close to your actual use.
 
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