Not worth the inconvenience, no need to push your luck, why would it matter if you knew exactly the capacity of the tank? How you drive makes large difference of your fuel economy, so there is no point trying to find exact volume of gas your car can hold, or how many more miles you can cover after the reading says zero.
In driving over the last 3+ decades, I've only run out of fuel twice, fortunately both times I was going at reasonable speed and was able to coast into the gas station nearby without requiring a tow or borrow a fuel can, in fact the second time I had just got going after the traffic light had turned green, the car died half way through the intersection, so I put the clutch in and coasted into the gas station across the intersection and stopped right by the first pump.
I got lucky, and never did that again.
In driving over the last 3+ decades, I've only run out of fuel twice, fortunately both times I was going at reasonable speed and was able to coast into the gas station nearby without requiring a tow or borrow a fuel can, in fact the second time I had just got going after the traffic light had turned green, the car died half way through the intersection, so I put the clutch in and coasted into the gas station across the intersection and stopped right by the first pump.
I got lucky, and never did that again.
