OK, I'm a newbie. I have a 2006 2500 Turbo with only one mod. The air filter and box has been changed by the previous owner. I'd have to look again to see what brand it is. Anyhow, I'm using the truck for more leisure driving right now but plan to tow a large trailer (20+ feet) for motocross with part of it for camping. I'm looking to increase the fuel mileage from 17 mpg combined to at least 20+ mpg. After doing some research, it seems I need to start with some sort of chip or programmer. Anyone have any ideas and/or point me in the right direction for the best product?