I've been thinking about the trade offs between a high-range EV vs. a PHEV. For me, a pure EV with less than 500 mile range couldn't be my only car, however it could be a secondary car (used for daily commuting, then switch over to something that takes gasoline if I'm away for the weekend).

But even for a daily driver, most days I only need about 50 miles range on most days. So for a Tesla model S or 3, I'd be hauling around the weight and expense of a 250 - 350 mile range battery that I won't be using 95% of the time. So I'd rather have a 60-mile battery (like the Volt), but with a high performance electric motor (like a model S), and a very low HP (small) ICE engine that won't add much weight. For extended-range driving, the electric motor would provide acceleration while the ICE directly powers the rear wheels and provides cruising (and mild charging when the battery gets too low).