Honestly, the change in gas mileage was pretty noticeable. With stock tires i was getting incredible mileage for a truck, almost always in the 20s, but now I'm lucky to get 16. Some people don't really care about that or claim it doesn't make a difference, but it did on my truck and it was rather sad. But, I do love the look of the truck now. If I had money and time, a gear swap could probably help out a bit.
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