Elon Musk gave his minions another reason to squeal on Sunday when he made the bold prediction that, within two years, a customer in Los Angeles, using his phone, will be able to “summon” his electric car to drive itself — and charge along the way — all the way from New York. “I might be slightly optimistic about that, but not significantly optimistic,” he said in a conference call with reporters ahead of the big Detroit auto show this week. Musk also took his prediction to Twitter, where his tweets tend to cause a stir. This, after the Tesla visionary announced a “baby step” in the company’s “Summon” capability, which for now allows owners of the Model S sedan to park in a garage or a perpendicular spot without having a driver at the wheel. What’s more, the car can open the garage to let itself in. Tesla TSLA, -1.49% understandably, asks that customers get used to “the next step toward fully autonomous driving capabilities” on private property. Here’s a video showing how it works: The software upgrade, which can now be downloaded, restricts speeds of the Model S in residential areas to just five miles an hour OVER the speed limit when in autopilot mode. Also, vehicles won’t be allowed to go hands-off on residential streets or roads without a center divider. Musk had said during a recent conference call that the company would probably need to update its software after drivers posted some risky behavior behind the wheel. Like this, perhaps: More from MarketWatch