ideally you don't wanna let it get that low... lol. Also.... helpful hint for everyone.... my dealer told me to use nothing less than 89 octane. Not for performance reasons but because 89 is where they start to "regulate" gas. 87 could have all sorts of contaminates and stuff. Also i read on the net that Sonoco gas has the least amount of sulfer parts per million in it (sulfer is bad for the aluminum in our motors).
PS. I filled up today (on kickstand) to about 1/4" above the bracket and got 6 bars =)