Controller efficiency tends to be ~97%+ or similar, motor and charger are ~80-90% depending on the specifics . Everything else is variable and depends on driving route. Even if my lighting system draws 300W, at 60mph that's only ~5Wh/mile extra. Otoh, if I'm stuck in heavy traffic at a 5mph crawl, then my lighting system turns into a ~60Wh/mile draw, fairly significant. The same roughly goes for other electric accessories, albeit w/ different parameters.
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