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Anyone use a tuner, and get good results?
I have a 2015 2500 HD 4x4 with the 6.0 gas engine, and 6 speed transmission. It eats about as much gas as you'd expect. I've been told tuners can make the truck "learn" to dispense fuel more efficiently. Is this true? Is there any tuner that will provide a worth while increase in mpg, and general performance? Thanks.
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