Power Chip for 2011 Selverado 6.0
 

I have been towing a 26 Foot enclosed trailer for 15 years with my Chevy 3500 dually with a 6.0 gas engine. It averages about 8.4 MPG. I have seen a number of ads concerning chips that plug into the computer interface. They range in price from $70.00 to $125.00. I would like some input as to whether or not anyone has had experience with any of these products. Let's hear your experience and advice concerning these products.