Thanks for the replies guys.
I filled up today after 205 Klms. and got 11 litres in the tank.
So I figure I can do about 240 Klms. before I hit the reserve.
On that kind of distance I should be able to get another 40 to 50 Klms. to empty. If my sums are correct.
The reason I asked is I have a trip planned for April down South on the inland road. There are quite a few big gaps between service stations and I will be 2 up and fully loaded.