Is there a reason why they haven't implemented a smaller diesel into the 1500 model trucks? I don't mean just GM, I'm also talking about Chrysler and Ford as well. What's the purpose of leaving these without the diesel option when they're used for work as well? I think putting a smaller diesel intended for what the 1500 does now is a more economical decision due to just what the motor could be capable of without the heavy consumption of fuel in the process. Just curious of course!