No Full Charge. Too cold

[Adventureboy]

"too cold to charge"

It will definitely heat the battery if it is too cold to charge. I plugged in early one morning for 1.5 hours on my 9.6kw charger and out of 16kWh delivered, less than 2 kWh went to the battery because the rest went to heating it first.

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[Robocop]

One thing to note:
A Flash (or any other EV with a 48A on board charger) will never input more than 48A to the vehicle. So the net charge rate will reduced by the power required to run the heater. The vehicle cannot get “extra” power from an 80A EVSE to power the heater.

This is the answer right here. The OP's truck has 48A on board so it cannot accept 80A. Since the OP hasn't responded to confirm if his truck has dual on-board chargers, we have to assume it doesn't based on what we know about the model year. The truck can only charge at 48A, that is it, so it will take a little longer when it is cold.