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I would NOT use "D" cells to power a car, I tried that with my electric bike and it failed, wired up a string of 30 to get 36V and 10amp hours, the 20 amp draw that it takes to go up the driveway really heats them up and drains them down really fast, if I'm carful I can get about 6 miles out of a charge with them because they don't react well to the high discharge of a motor.
One of the other people with a Citicar said they figure they use 250 watt hours per mile, and that is with a 35mph top speed, a single "D" cell is 1.2V and if you get 10amp hour then you have 20 watt hours per cell, so at higher speeds could you use 500 watts per mile? so 25 "D" cells per mile, or 1,500 of them to make a 60 mile trip, just remember "D" cells don't like to run large motors.
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