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It depends on the volts and amps being pushed into the car but you should expect to get anywhere from 15-19 mph while charging. This assumes 200-240 volts and 30 amp using the J1772 adapter.
If you know the specific location you plan to use look it up on plugshare.com often times people post the actual volts and amps of a station, then you can make an accurate calculation with that information