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A GOOD efficient/aerodynamic/light car will use 250Wh/mile. You can calculate your range with that.
Higher voltage will give you more power as will a higher amperage controller. Also, being as those are only 7Ah cells, I would be wary of pulling a lot of amps out of them quickly. They only have little tabs. I was going to use these same type of batteries on my mower, but decided to use larger batteries instead.
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