We hope the “charging mode” will do this and not disregards efficiency simply to fill the HVB.
I can envision if it’s done properly, that the red and yellow dots in the graph which are below the cyan dots will “move up” towards the cyan dots and the mostly red and maybe some yellow dots above the cyan dots will “move down“ by using EV to supply some of the torque to bring ICE into the blue dot area. If too much charge is accumulating in HVB (you would want charge depleted before plugging in), one could turn it off and run in EV.
Otherwise, it’s just a “gimmick” - a trick or device intended to attract attention, publicity, or business. Ford has never done this - have they? ? I will note that in normal daily driving, most likely would have no need / use of the charging mode as the average daily commute is around 16 miles one way.
I believe if it works like above, it could improve FE several % on the one or two round trips we make every week of 100 + miles and on the several longer trips we take each year. I hope once the Escape plugin is available for testing and review, the reviewers will give feed back on using the charging mode.