The amount of power (energy expended over time, or work done over time) that is extracted from a battery will be the same, no matter the type of battery that is used.
That energy will need to be replaced to keep the battery charged, regardless of the type of battery that is used.
There may be an advantage if the marine battery is more efficient itself; i.e.-delivering and receiving energy with less internal losses. I'm no battery expert, so I can't speak to that.
You would have to do some ABA testing to prove any advantage. I doubt if you'd see any change that would show through the normal tank-to-tank variances. At best, it would be one of those "every little bit adds up" mods, IMHO.
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-Terry
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