on my RR8 the reserve light comes on @ 3.7L. After a few seconds delay, the trip meter start to flash 0.0 which represents how much fuel you have used since the low fuel trigger. So it goes 0.1,0.2,.... and so on. At 0.7 it means you are running on fumes! It is not very intuitive and really too complicated if you are on the bike riding and working out if you can make it home or where to stop for fuel! Once you get into low fuel mode, the your A trip meter is also reset as is your mpg Those number could be different on 2013 versions MY RR8 does about 160 miles before the orange light is on but a lot depends on your riding style and where you ride. They drink a lot of fuel in traffic jam!
