I'd say its about normal providing if it's an
18 litre tank
and if your riding are mostly made up of small trips with a lot of stop starting.
There's about 3.5ltr in reserve when the light comes on, so you'd be getting 140 miles on 14.5 litres. That's 43 mpg.
I get about 45 mpg if i'm stop starting a lot but I can get 55 mpg on longer runs. I have the Foxeye model (02 onwards) which has
22 litres, and on average if the riding is mixed with 70% of short trips at 45mpg and 30% of longer trips at 55mpg, then I have no problem in getting 200 miles. It looks like you have been reading guys fuel data that have the bigger tanks. If you have the latest model and only getting 140 to the warning light, then ya...either there is something seriously wrong or else you are doing a 100+ mph all the time!!