Interesting question! Unfortunately, I don't have any answers for you and in loads of reading, I haven't heard of anyone trying. Don't let this dissuade you though - someone out there may have done this very thing.
The below won't answer your question, but may be helpful.
I find that I can easily get 450k out a tank with my riding style. What's not so easy is the fuel light coming on after 330k that messes with my mind.
While in use, I have never put more than 19 litres into the tank and I regularly get between 23-25k per litre, which provides a nice safety margin when budgeting on 450klm range.
There was some discussion on this forum that only 21 litres in usable, however, Giovana of Gili Moto assures me that all 22.5 litres is usable. I have not tested.
Good luck with your research.