So, here’s a thought. You know how vehicles sold in America have a “city” and “highway” MPG rating? And you know how cellphone companies rate their devices with a “standby time” and “talk time?” Why don’t notebook makers follow suit? That terrific talking point is coming at you courtesy of AMD’s senior vice president and chief marketing officer Nigel Dessau, who just recently wrote up a blog post on the subject.Today, users are given one single notebook battery life figure, and every single one of us consumers