The point about the charge levels is exactly that an electric car is not like a regular car. You can fill up a regular car in seconds, so going only 1/4 full is dumb, unless you're having money problems. Spend the extra 30 seconds and fill it up. With an electric, it isn't like that. Charging at a regular power outlet takes HOURS. So you only charge it up enough to get you to a supercharge station. Further complicating matters was the fact that a cold battery will read lower, and go up as it warms up. So it seems like a very difficult problem to estimate range, or how much charging you need to get to where you're going. Again, charging = time. According to the story, the Tesla rep told him the range would increase as the battery warmed up, so after charging for an hour as advised, he left even though the range estimator still showed him short. (*)
Also, the charging speed is not linear. The first 50% goes quickly, but to go above 90% would take a long time even at a superstation.
(*) This is where the story breaks down. Instead of "following orders" blindly, he should have stayed where he was, and kept charging as the battery warmed up, until the range reading allowed him to get to the charging station. Had he done this, there would be no story.
Tesla is just being dumb here. They are hyping up this car as the vehicle for Joe Everyday, when it's clearly not ready for prime time, and is nowhere close to being a replacement for all common use cases. For example, as much as I think electric cars are sexy, it would be pointless for me to get one. I barely drive around the city (I work from home), and regularly take long trips (600-1000km each way), so a 200-300km range electric car is teh fail for me. Call me when battery technology makes the next leap to power a vehicle 1000km+ on a single charge.