Have a 2014 6.7 that I bought a DP tuner strictly for fuel mileage. I bought this tuner based off of the recommendation of Powerstrokehelp.com's very own Bill, whom I trust very much. BTW, I opted for an emissions friendly 35hp tune for towing. Was I wrong to assume that I would actually see an increase in fuel mileage? What tuner should I have gotten for heavy towing and an uptick in fuel mileage or does that exist?