This just about sums it up. EV miles are counted for electricity from the grid, not electricity generated from gasoline. Ford is the only one that counts regen miles as EV miles, which is extremely misleading. I'm kind of surprised there hasn't been any lawsuit forcing them to stop.Once the battery is empty, you are running using electricity produced by the Gas engine.
During that time, all regen miles will be credited to the gas engine, because you are recuperating energy that was generated by the gas engine.