I got a pop up while searching some websites about GForce and ACD chips for my 08 ram 1500 saying up to 5mpg better mileage and up to 30 more H.P. , it isn`t a tuner with adjustable settings like some of the more expensive ones both are less than $75 . anybody here have any experience with them? Are they really that good? My H.Q.C. tows great but I am always looking for more and don`t really want to spend the bucks on an expensive tuner.