Thanks guys, that's all useful information.

The reason I ask is I plan to use the XTR on a 2000 mile trip to and around Skye later this year, including venturing into the "wilderness" a bit. I'd really like to build up a good idea of fuel usage before then to keep the top-ups to a minimum and avoid me getting stuck somewhere in the remote mountains!

I'll aim to fill up at 160 miles the next time and see how I get on. Perhaps I'll keep a litre bottle of fuel in my rucksack just in case!