Yes, but in practice for a fit diver, 50 is better as you take less
beating if you can deco from the gradient successfuly, which I can. I
use no deco gas if possible at all.

David Chamberlin wrote:
> 
> I'd also be interested in hearing some comments on this.  A while ago,
> when asked about single gas usage, I could've sworn JJ responded that
> for shorter dives in the <50m range, O2 would be the choice.  I always
> found that curious since JJ and G seem to try and clear out their deco
> as early as possible, which would indicate 50/50 would be the better
> choice.  Then when trying to find the message I was thinking of, I
> stumbled across this post from JJ:
> 
> > If I were to be using one bottle it would be the 50. Depending on the dive
> > I may carry two small bottles which I do a lot. On occaision we do the 50%
> > on the first dive and if its a repet we would do the 50 and then both on
> > the second dive.
> 
> And then G replied:
> 
> > JJ will answer , but he and I always choose the deep stops over the
> > shallow, and having the better gas deep is not only in keeping with
> > getting that part done right, it conforms to our experience. Most of my
> > ocean dives are one gas dives - I do not generally see the need for the
> > oxygen at all on a short hop first dive, and prefer not to take the
> > beating of using it for not reason. On the second dive, I would take
> > both gases. The oxygen window explanation is the correct one in this
> > context of doing the deeper stops as well.
> 
> But like Simon, I assumed that for a shortish, shallowish dive, O2 would
> be the better choice for many of the reasons in the Baker's Dozen.
> 
> Lest I be smote, I hasten to add I'm not in any way trying to impune G's
> experience/knowledge, I would just like a clarification on what the
> "best" single gas to use would be for a shallowish (<=50m) shortish (say
> <= 30min) dive.
> 
> Thanks,
> Dave
> 
> Simon Murray wrote:
> 
> > I would be interested in the feedback of any other people as to choosing to
use 50% from
> > 21m instead of o2 as a deco gas on shallower (say up to 50m) dives.
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