light?

for some reason the max light on the dash now flashes at 6000 revs it never did that before,any reason why?

I am running in my Tuono R and I need a bit of advice. I find the fuel warning light seems to go on at about 100-120 miles. When I refuel I usually add +/- 3 gallons. I believe the T holds about 4.76 gal of petrol. It seems the warning lamp is a bit premature. My question is, in your experience...