It seems that it's different for every VX. I personally drive it down close to empty before I fill up, but rarely does the idiot light ever come on. When it does, and I feel like pushing the limits, the guage will sink well below E and I've driven over 30 miles further on a couple of occassions (highway miles). By the way, I've never run out of gas (fingers crossed ).

Does anyone know what kind of a sensor the VX is using?