Thought I would post this, I've had the PC for awhile now and love it. I took it off last week when I took the truck in for a possible warranty issue. I tow a 5th wheel roughly weight 8500-9000lbs with my 5.7 2500 occasionally. Took a short trip over the weekend and averaged about 7.7 mpg while the PC was off. Before we left, I put the PC back on and we averaged 9.4 mpg on the way back home. I have an aftermarket CAI and its brutal with the PC off especially going up a hill, so loud. Definitely a more enjoyable ride when the PC is connected