Following a navigation system's instructions without driving into a ravine is hard enough as it is -- can you even imagine how hard it'd be if you kept losing GPS reception every time you drove within range of an LTE tower?
According to the journalist, he wasn't provided with "detailed instructions on maximizing the driving range" before his trip, and he placed roughly a dozen calls to the folks at Tesla about how he could address the car's declining range and make it to his destination.