I'm struggling to get a grasp on the numbers she's citing for efficiency, almost to the point that I began questioning if there was an agenda here.

And she is doing the same thing most influencers are around this tech, being one-dimensional. Take hydrogen, the optimum scale is neither national energy storage, nor single person vehicles. But if you look at more of a city block level, where the excess heat can be used for hot water instead of fossils/electricity, efficiency ramps up!