Literally, YMMV on this one.
So many factors affect fuel tank range. Tyres, mapping, engine temp, ambient temp, ride style, ride route, exhaust etc to name a few.
It's better that you just trial and error this for yourself, but in a safe way.
Whenever you go to fill up from reserve, note how much mileage you did and observe how much it takes to fill the tank. That way you will eventually know how far you can stretch.
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