EskimoBluDay, Greg,
Yes, I agree that discussion about comparitive consumption rates are important. It takes experience to learn this. Any beginner diver should realize that somebody diving one tank has a need to come up earlier than the buddy with two tanks. And don’t cheat on this. Also, a beginner will consume more air than an advanced diver. Huffin and puffin vs streamlining. Yet, my quest for the math has been frustrating. Both dive buddies should have a pre-dive understanding of their inequality. Calculations are important. Standard formulas are critical. But, we have divers with wide range of math skills. Even good divers can have a bad day putting two and two together. So, let there be peace on earth about this. We need a comrehenaive and exhaustive document on this calculation. And then, true to the discussion, 20 or 40 examples can provide detail seperation between Dive Plans that are safe, and those that are very risky.