I forgot to add, when the lights comes on, it says around 35-37 mi to go before empty. I ride in slick, so roughly around 130 mi per tank i am assuming that this bike can go, give or take depending on the riding style. Seems about the same as my 08 r1 before it was modded.
what puzzles me is the fuel tank, it always fills up less then I am assuming. I guess the light was programmed to come on earlier than the reserve 1.1 gal. Logically If the light comes on when the reserve is reached at 1.1 gal. one would think that 3.5 gal. should fit the tank. But not the case with my bike. For example, I rode 17 miles after the light came on, and when I went to fill up, only about 3.1 gal. which leaves about 1.5 in the tank. Unless one is supposed to top it off to the cap.
So with this being said, I am estimating the light comes on approximately when 1.5 gal is left.