Two bars HV gas, 52 miles HV range:
Went to gas station, added about 1 gallon (car off during filling). Some time later (and after several on - off cycles), still have two bars gas and 52 miles HV range.
I added another gallon, should be just over 3 gallons total now. As per the previous poster (said no changes to 4 gallons), I still have two bars, and 52 miles gas range. Ran the engine for a bit, now 51 miles, two bars.
Well, I added two more gallons gas, no change, then filled the tank, no change. So, this morning disconnected the 12V battery ground terminal, then using a 1 ohm resistor (with the 12V battery ground disconnected), connected the plus terminal to ground for about a minute or less.
The readings are all normal now, all gas bars and full HV range as expected. Just a computer glitch I guess. Good news is, it did not dump my user settings, presets, or my customized center console. So, all good there. Standard driving around for a few minutes reset all the alarms, the regular case for a Clarity 12V battery reset.
Too bad I did not try the battery disconnect reset at one or two gallons, oh well. All is good, no trip to the dealership needed, a blessing in itself.