Absolutely. Good points.
CalCars calls their Prius a "Prius+". To me that is as simple as possible. The plus would mean that energy is added to supplement the gasoline on board and any kinetic energy the car could scavenge in transit.

It would be the same problem for pure EVs. They could not claim X miles/Gallon. It would have to be so many miles per energy unit. So a combination gas/electric might have to be described with the total amount of energy used (liquid and electric). This should be a good topic for discussion.
Thanks

Mike Maline - Sdctcher
2005 Ford Escape Hybrid Owner
California School Teacher