So far 380, but I still had 4.5 gallons left in the tank. I'm still trying to figure out the low fuel light. My navigation system directly corresponds with the low fuel light because it will say 0 miles left when the low fuel light comes on. Other than that I don't push it that much, usually I fill up when it gets down to a quarter, at which time I still have 10 gallons left.
The leftover fuel is also used to cool your fuel pump. This is very important if you have a FFV as the pumps run a bit hotter than the standard ones. I normally never see my light, as I fill up before it gets to that point.