Water or oil cooled.
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I like how they quote the weight of the drive axle/motor... but wait, what about the weight of the batteries to power the thing?
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What about the weight of the gas tank, shift lever, etc.? The thing about electricity as a source of energy is it's fungible. It could come from batteries—of some chemistry and energy density—or from a turbine generator, super-capacitors in a KERS, or a little brass ball on a miniature Eiffel tower in the middle of the roof if you can figure out a way to make that work.