I usually fill up every day riding. I used to ride a couple days on a tank. So it's not like your tank will be gone in an hour. What you should do is find what your tank fits. Then go ride and keep an eye on it and just figure how long it will take to go empty. I would not imagine not being able to ride a full day unless your riding all out for 8 hours but everyone will need to fill up after that. Sorry I gave you a scare on the gas draining thing, but burning gas is a good thing.
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