If you fill a ICE car up with less gas you need to get to your destination and attempt to make it anyway, you are going to need to be just as particular about your technique.
Oh no, it is a perfect analogy. He stopped filling it up, and he and you act stunned when the car doesn't move as far as he wills it. Hell, is this even an analogy? It's just the same fucking thing.
If you want to make the point that charging takes to long, or that there are not enough chargers, go right ahead. It is pretty easy to make that point convincingly without resorting to intellectually dishonest bullshit about the car requiring hypermiling techniques.
Bad analogy, this http://www.statisticbrain.com/gas-station-statistics/ says that they are 121,446 gas stations in USA. It takes 5 minutes to add fuel for another 300 or so miles and they accept credit cards :)