Are you getting hung up on the syntax perhaps? We've been discussing what we're calling running tanks dry, but in reality I think most if not all of us are really discussing running tanks until the engine quits. When I say that I ran tanks dry regularly, it is very likely those tanks were not actually bone dry. In fact I know they weren't bone dry because there were a few times that I would run a tank until the motor quit, then I would lay a wing over into a hard slip and see whether the tank or my thigh muscles would quit first. I only did it a few times but my thigh always quit first after 15 minutes or so. No one ever plans to get into a fuel exhaustion kind of situation, but good to know that if I ever found myself in one, putting it into a slip could buy me enough time to get somewhere suitable to put it down.