It depends on how hard you are on the throttle. With light throttle application, you are usually at 5-10mph before the engine turns on. If you punch the throttle more aggressively, then the engine instantly comes on, and the motor and engine work together to accelerate you faster. This will be indicated by the iDrive hybrid screen showing "Engine On - System Request"
In either case, it's responsive and smooth. No complaints.
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