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I had linked to something about this before, but the images are gone... Assuming your car doesn’t already have it, PWM speed control. At full speed it doesn’t matter, at the lowest speed the amount of power drawn is small. IIRC I think when you’re running medium or low-medium with resistors you could be using 75-80% of the power of running full speed, and have half of it being used by the resistors. The percentage being wasted on low is greater, but the total draw is much less.
I don’t think it would be worth it unless you get a junkyard PWM speed control with connector, and it used as many or more individual speed inputs as your current resistor.
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