Having established a fast-charging foothold in California for its electric cars, Tesla Motors has brought its formula east, opening two ultrafast charging stations in December that would, in theory, allow a speedy electric-car road trip between here and Boston.

But as I discovered on a recent test drive of the company’s high-performance Model S sedan, theory can be trumped by reality, especially when Northeast temperatures plunge.

Photo Credit: Peter Spirgel, an attorney with Flaster/Greenberg, drives his new electric car, a Tesla Model S performance model near the law firm in Cherry Hill, New Jersey, November 12, 2012. Michael S. Wirtz / Philadelphia Inquirer/MCT