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Not sure you guys got Kevin's point.
There is NOT a 50/50 chance of having more than enough gas. If you dive by the rules, you will always have more than enough gas.
Worst case, you are down to a third in each tank. You suffer a catastrophic loss in one tank.
However, if you are down to a third, you are at your exit. A third of one tank AT your exit is more than enough gas.
Now, interpolate that to any point in the dive ... If you practice good gas management, you will have more than enough gas.
Tapatalk by Droid
Well ... not necessarily. If you're diving thirds, you turn on 1/3rd ... so let's say you lose one cylinder at just exactly the worst time ... right at your turn pressure. You've used 1/3rd out of each cylinder. You have 2/3rds left in each. You lose one ... you now have the other to get out.
You've just lost (overall) your 1/3rd total reserve ... and you have exactly the same amount of gas to breathe going out as you used going in ... you just have it in one tank instead of two.
Moral of the story? Don't breathe either tank below 1/3rd before turning ... there's no 50/50 about it ...
... Bob (Grateful Diver)