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My 3 consistently shows 5 mph on both the in car screen and on the phone app when charging at 118-119 volts and 12 amps. This could really be anywhere from 4.50 to 5.49 mph due to rounding.
Showing a 7 mph charge rate with a starting (no load) voltage of 123V dropping down to 120 (with a 16A load) by deploying a
5-20 gen 2 UMC adapter on Model 3 LR.
Not that you asked, I achieve a 15 mph charge rate with a 6-20.