Not trying to get off-topic here, but it has always bothered me that plug-in modified hybrids (such as the Prius plug in mods) are labeled as '100 MPG Prius' or '100 MPG FEH'.
I think that this kind of labeling is misleading. These cars do not acchieve a true economy of 100 MPG, because they do use an unspecified amount of grid energy to charge batteries. I'm not sure what the best solution is, but I suggest we come up with a better way of labeling such cars.

How about 55 MPG + 80 EV miles?

Or something akin to that. Such a label would identify the underlying ICE-based fuel economy, as well as the additional EV range derived from grid energy.
Other suggestions are welcome.

M