John, I have issues with mine too. I have an 06 V215. I have gotten used to knowing how much gas I have, and feel confident that the tank is so big, that I definitely have enough for a long hard day. But, I have had occasions (not uncommonly) where the gauge is flat out wrong. I would say it works pretty well about 60% of the time.
I think it's a design flaw. Hard to imagine that being a difficult engineering problem to solve, but it's what we have.