how many litres are left when the light comes on? two or three?
Got no idea, but I tend to just fill up as soon as I can when the light comes on. I never fill up with the bike upright, so fill uo on the sidestand to just below the vent tube

(well either is that or the overflow). I probably don't ride it right as I do a lot of WOT short bursts and blipping the throttle in traffic in low gears. It's strange because it doesn't matter if I do town riding in traffic or get out on to motorways at three figure numbers or do a mix of both. 70-80 is what I have always got. I know my fuelling is good as I have had it dynoed, if anything it's a bit too lean down low up to 5 though. Petcock is not leaking, float valves look good, but I think I will change them anyway as they cheap. Gearing is standard.
It's weird because you get all these threads on how much fuel do you use and there are so many variations from bike to bike on here and on the Superhawk site.. Some just seem to drink more for no apparent reason. I have been chasing down how to get better economy fro ages now, but have just about given up and just have to accept that it is what it is. I'm not going to change the way I ride. I ride the way I do and that's that, I'm not going to pussyfoot the bike around at low revs. If I had to change the way I ride I may as well get a different bike.

Nah, I love my storm, it's fun, and sounds great. I have a 19L tank to stick on at some stage, so it will get a bit better.
(:-})