15L/hr, I use that just priming!!
Only joking, though I am more used to 40l/hr so I'd really be cutting it fine if I had to carry 10L!
If you are really determined to do the trip without stops, maybe there is a way of arranging to get 10lof fuel at the strip. Friends? Or whoever cuts the grass almost certainly has a petrol engine mower..hmmmmm tractors take diesal dont they.. oh well, just an idea.
D