> Er, no, traditional gas cars fuel economy is optimal in freeway driving, despite the fact that more delivered energy is required than at slower speeds.

Depends on how you define "freeway driving": If you mean constant speed, then yes; if you mean high speed, then no.

> Hybrids and electric cars, which can be closer to peak delivery efficiency over a broader range of speeds, have peak economy at lower speeds.

So do ICE cars. Energy (=fuel) consumption rises with the square of speed, because aerodynamic resistance does. That's just a law of nature, irrespective of engine technology.