Howdy, I’ve been hearing over the years that it is possible to buy and install a plug n play tuner into the computer of a 97 F-250 PowerStroke. I am looking for increased fuel economy rather than HP as it is my daily driver. However, I haven't been able to find sufficient information. I have seen the Vertex tuner, but I haven’t found much user info about it. Any info y’all have/want to pass along will be greatly appreciated!