A gas car cannot bring its full horsepower to bear from a stop. It can only do that when its engine rpm is in a specific range.
Now, you can keep the rpm in that range better by using more gears, but then you spend more time switching gears, and during that time the engine isn’t doing anything useful.
Electric motors have access to their full power output across a wide range of speeds, requiring no gearshifts, and giving them almost as much torque as they could want from a stop.
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