There was an interesting chart posted a little while back (I think it was re Tesla but would apply to every EV using lithium ion). Charging from 0 to 100% of battery it lasted 500 charge (a year and a half?) while one of the other options was charging 30% to 70% was something like 40,000 charges. The less of the top and bottom you use, the longer the battery lasts, just not into infinity and beyond.Thats a lot of reserve power that could be used for pure electric range, in my opinion.In fact in my 6-7 months of using this car I have noticed that even though it shows 0 electric miles, it does putt around on battery only as long as the power demand is under 18-20KW. Only when the power demand goes above that, the gas engine kicks in.
I would imagine/expect that a electric + gas car would be either 100% electric or 100 gas (when battery runs out).
Now I am curious what do other phev hybrid cars do ?