Hi all I've been out tooling in my 86 300zx n/a. My question is when my gauge gets to zero how much cushion do I have left. I know that bitchy betty is supposed to come on and tell me that my fuel is low but she hasn't done it yet. I drove it pretty low-gauge pointed to E and she's quiet as a mouse. When my guage gets to E in my other car you're already walking. I've noticed that theres a smaller guage located below the original which i assumed was to kick in once I got down to 1/4 tank to meter it down farther but I've never seen it move so i assume it's broken. I don't much like running out of gas so I try to to get close but I think it's something that would be handy to know.