Two 6 volt vs two 12 volt run time

Bumpyroad wrote:

Gjac wrote:
From a practical sense I think you were informed correctly if you look at life cycles per cost. s.

the statement was "I was just informed that two 6 volt batteries would run the residential refrigerator many times longer than two 12 volt batteries. I wonder if this is just hype? "

where do life cycles per cost enter into that information? run many times longer was the claim.
bumpy

Don't most of us look at the cycles per cost when buying batteries? Or anything else for that matter? I think that is what he was trying to tell the OP. At least that is how I interpreted the explanation. I don't think he was talking in a purely theoretical sense of comparing AHs. That I why I said from a practical sense. Does it make sense to buy 12 v starting batteries or marine batteries that won't last as long as 6v GC batteries ? Or pay twice as much for a 12v deep cycle one that I has a comparable life?