09 xtr, on supermarket fuel the light comes on about 120 miles, on shell or other branded fuel the lights on at 140 miles. you can comfortably do 30 miles from when the light comes on 1st time. once the lights on constant you want to be filling up within 20 mile MAXIMUM!
Also when the light comes on it starts the fuel trip at zero, if it then goes off again and you cover more than 7 miles before the light comes back on it will reset to zero again, likewise once youve filled up and ridden for 7 miles the trip display will revert back to whatever it was set to display before.

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I'm always in the sh1t, only the depth varies