I assume the gauge was working right. I assumed I was empty, I put in $11 and it jumped to the point I assume $11 would. My logic mught be flawed if I can find any other reasonable answer for what if anything could prevent the gas from going down or at least cause the fuel to enter the tank slower than expected. I expected and assumed I was low, having more gas in there or enough to fill the entire tank and neck doesnt sound right. I just dont think there could be that much in there based on my last fill up and subsequant driving.