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I am using eight 8v batteries for 64v. I replaced the well-expired set of eight 6v batteries that came with the Citicar about 4.5 years ago with six 8v batteries. It was still at 48v, but about 140 pounds lighter. I used the space under the driver's seat for the controller, aux battery and DC/DC (upgraded at the same time as the new pack).
I recently obtained two used 8v batteries of about the same age and condition as my 'aging' set, and installed them along with the other six batteries for a total of 64v.
Since the original Citicar came with eight batteries, and I wanted to try out a higher voltage, I moved the controller back to where it was originally behind the passenger seat. There is still room for the DC/DC and aux battery under the seat, even with eight batteries. In your Commutacar, you don't have the same space issues.
I don't remember if you have a contactor car, or are using an electronic controller. I suppose that one could replace the 6v batteries in a contactor car with 8v, but you'd have to go with relatively small battery cables (#6 or so) to limit amperage through the stock parts so they don't fail. At speed, amperage really isn't an issue with a C-Car because the tiny motor can only consume full power below about 1,000 RPM; it's the voltage that makes it go faster.
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