1981 300D fuel reserve

I will be replacing my fuel tank screen whenever I get time and have arranged for there being as little diesel as possible left in the tank. I've never refueled for more the 16 gallons, so I don't know how much of the 80-liter (21.1 gallon) capacity is usable. Of course, I want to drain as little as possible. Also would be great to not run out of diesel pursuing that goal. I have no idea if my low fuel light works. So, my questions are: how much diesel is usable in the 1981 300D non-turbo? And when should the low fuel light come on if it works? Thanks, Doug

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