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Hi Wayne,
Put a transmission in your car. Even though you can run the motor direct drive (4:1 differential), generally speaking, the lower the motor's rpm, the higher its current draw. High current gives great acceleration, and high voltage gives higher RPM, but current kills your batteries and your range. With direct drive, from a dead stop, you're pulling a lot of current to get your car moving. The 4:1 differential is great if you have a transmission and use 1st and second gear.
Keith
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