I don't like to push it. I'm averaging 48 mpg, and the manual states there is 1.05 gallons of reserve fuel when the light comes on, so I'd imagine I could push it past 40 if I wanted to end up stranded, but I don't think I've gone past about 25.
I'm also one of those paranoid people that fills up as soon as the light comes on. I noticed that when it did I had .9 gallons left which I thought was allot considering. I currently have the trip meter set on since the last refill so I am going to be curious how many miles go by before the light hits on.
I made a point of checking the trip meter today and the light came on at 110 miles but there was a significant amount of fuel left in the tank pretty much on with the reserve amount stated earlier, so no need to worry unless you're 45 miles plus from a refill when it goes on.
I've done over 30 regularly as I have just done a 2500mile trip in Spain and it kept the number of refill stops down
Have faith - the bike will do 45-55mpg and there is virtually a gallon left when the light comes on