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I guess turning it off and taking a drive will answer that. Ive seen it recommended if you go autocrossing to just unplug it.
I know the gizmo that handles trac, skid, abs, etc is always working, doing self checks, circulating fluid around rather you need it or not. The power used is likely less than electric power steering. I disconnected my electric power steering and notice 2 mpg gain on my commute.
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