Thanks for the advise guys, I'm pretty in the groove these days with gas - I tend to fill the bike pretty full as the first couple of sessions are always a bit of coming back 'up to speed' (for me anyways).
I also take 2 x 5L gas cans and always come back home with a little gas to spare (dont like to leave too much of the stuff standing around both from a safety and deterioration point of view).
Guess I need to get my rug out and pray to the TD gods to have a word with Solaris
Cheers - Frank