IMHO, be real careful working around the batteries, 72 VDC is getting high enough to cause a bad electrical shock, unfortunately, I speak from experience. Now to answer your question, from a pure engineering stand point, higher voltage means lower current for similar size (HP) motors. Lower current translates to lower losses in wiring and heat, which should get you longer run time. I have not heard of any of these, are they still lead acid batteries, or are they the newer Lithium battery design?
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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