LOL...i do exactly the same...mates can't believe that the Busa gets so far on a tank...as for the gauge i treat it as a general indication and i'd rather know the low end is reasonably accurate.I always reset the trip odometer as well. I start looking for a gas station about 190 miles. My fuel light comes on when I have 1.5 gallons left and when the needle is at empty I still had a half gallon left.
I do find my self getting nervous when I see the odometer go to 230 miles. I start to think about how many hills I went up and how much of a throttle jockey I was.