Ford wants you to know that its new 6.7-liter Power Stroke diesel V8, slated for launch next year in the 2011 F-Series Super Duty and rated at 400 horsepower, is quieter than the current 6.4-liter diesel. So the company prefabricated this very short video of the two diesels idling. Unfortunately, the Ford engineer talks right over the 6.7-liter. Which is a good sign, we guess? Suggested ad copy: "Ford's New Power Stroke: Won't Interrupt Your Conversation."