Strange question about cylinders

[Benjamin]

Before the actual question, yes I have read the manual. This doesn't appear
in it.

Now that that's out the way:
When diving doubles, what would the best way to enter the tanks be? If I'm
diving them as 2 independant tanks, would it be 2 tanks of AL80 size? If
I'm diving 2 AL80s, using a manifold, what would be best to enter? To just
pretend that it's a single 24 litre tank? Use a type of AL80 and a size of
22.2 litres? Or is there a recommended way to do this?

Benjamin
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