I will try when my millers runs out...probably in a month. Hopefully it will be possible to fill the full 500ml and not just the top 75ml ( approx.) section.
As above...you cant get much past the measuring chamber c.75ml. For me that's enough for 2 or 3 top ups since my mileage isnt great. Turkey baster idea is a good one!
A thin filler tube comes with the bottle but it leaked a bit when full. The bottle has a dispensing part of c.40ml. As the bottle becomes half empty I think it will be easier to dispense into the fuel tank directly.