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Stay away from products like that. They function by altering sensor inputs to the PCM in order to fool it into raising fuel rail pressure. This is always a bad idea...if you want to change the way your truck runs you should get a custom tune.
Same BS as the modules for gas engines that improve throttle response by changing the speed at which the throttle works, just makes it seem faster cause you don't need to press as much on the pedal.
as far as better mileage, I have experienced better mileage in my truck by accelerating a little faster instead of driving like there is an egg under the pedal. Get the truck up to speed faster. I tried driving like this for a few weeks and then driving extremely conservative and the harder acceleration worked better in my case. I assume thats how they claim better mileage, the throttle input gets adjusted since its DBW and the truck gets up to speed quicker.
as far as better mileage, I have experienced better mileage in my truck by accelerating a little faster instead of driving like there is an egg under the pedal. Get the truck up to speed faster. I tried driving like this for a few weeks and then driving extremely conservative and the harder acceleration worked better in my case. I assume thats how they claim better mileage, the throttle input gets adjusted since its DBW and the truck gets up to speed quicker.