Originally Posted by
pete m
Hi Mark, from what I see you have an `06 truck with the LLY motor right?, I, as mentioned got better mileage with my (2) LLY trucks than this LBZ, but can feel the extra power this engine has. I think you have the ability to get even better mileage with yours than I did because my LLY trucks were `05's that had the 5 speed, yours should have the 6 speed which should/could get better mileage due to turning less RPM's, I did notice mine running below 1800 rpm at 69 MPH while towing. I thought with this turning less rpm it would get better highway mileage running empty, but still could not touch either LLY, and the last one was a CC 4X4 dually that weighed a LOT more than my current 2500 HD does. Only thing I have done to my truck is the K&N air filter element, and the Superchips tuner, otherwise its stock.