+2. With a plug-in hybrid that has a battery range of 40 miles, I could probably do 80% of my miles without burning gasoline (and they'd be in-town stop-and-go lines where an ICE engine might be less efficient than on the open road). More importantly, I'd be (far) more likely to use most/all of those 40 miles/day if I knew there was no real down side to going over--the ICE just starts up and I can go as far as I want.
The battery capacity from 40 miles to 300 miles would be of very marginal use to me (might be different for other folks)--it would just (sorta) enable a "pure" electric car to be a (crummy) long-range car that makes me stop for a long time at an inconvenient place to recharge. It makes much more sense to use those batteries for 5 other plug-in hybrid cars, and give us each a cheaper, more flexible small ICE range extender that virtually eliminates range anxiety. And we can run the heat and AC if we need to, get out of town if there's a hurricane/ice storm, etc.