When is a truck not a truck? Well, that depends on your definition of truck, it seems, as many vehicles currently on dealer lots all around the country carry the truck designation from their manufacturers while most rational people like you and me would consider them cars.

So, why would an automaker call its car a truck if it's not really a truck, and why should you care? That's the subject of today's Greenlings, and it may be a bigger issue than you think. Remember, cars and trucks carry different fuel economy requirements from the federal government, and, as you might imagine, this is the reason why large automakers are putting some of their very untrucklike vehicles firmly in the Truck Bucket.

Read on to find out which vehicles we're talking about and how it impacts fuel mileage regulations.