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> One response I received suggested sticking to rule of thirds and indeed this 
> is what I have done up till now. However this means I am surfacing with
nearly 
> 2/3rds of my bottom gas in reserve due to using the EAN80 for deco. I feel 
> this is a little over conservative and looking to find a balance where my 
> contingencies allow for one of 3 possible reg failures. Maybe that's cutting 
> it a bit fine in some peoples opinion but this is what I am happy with.

On all my deep OC mixed gas, I used to use rule of thirds independently 
for each different mixture. Another way of saying "1/3 in, 1/3 out, 1/3 
in reserve" is "plan on using 2/3 of the gas and leave 1/3 in reserve".  
This means I would be switching from trimix to EAN with 1/3 of my trimix 
remaining, then switching from EAN to O2 with 1/3 of my EAN remaining. (I 
would surface with about 9/10 of my surface-supplied O2 remaining - 
keeping open the option of IWR). I didn't do this as means to minimize 
wasted gas, I did this as a means to minimize wasted *mass*.  (i.e, keep 
it as simple as absolutely possible for the needs at hand with adequate 
safety margin).

Aloha,
Rich

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