I keep the tank full and treated for ethanol and storage. I typically would have to run 100+ miles offshore to fish when the conditions permit. So I need to have the capacity plus reserve to make a round trip. I would be over fueled than worry about not having enough. I have installed a fuel management system that works with my Garmin electronics so I can keep track of the fuel conditions on the boat. I usually run with a friend that has as Cat with twin Yamas, his range is about 500 miles.
ET
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