As others have stated, if you are on the fence.. Go with Winfield. I did my tune with Goosetuned at 50,000 miles last year, I'm now at 70,000 and my only disappointment is I didn't do it sooner. People ask about gas mileage, that is going to depend on how heavy your foot is.. My mileage stayed the same with the tune. Drive it hard and you are in the 16 mpg range. I drove it back from the Ozarks today on a 2 lane and got 18.6. A Goosetune will give you that feeling you had when you first brought it home - Best Damn truck on the road....