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I have done some research but all of the reviews and HP gains are based on Ecoboost. However, you can order a performance chip for a hybrid. Has anyone tried one on their Hybrid?

That is my concern about getting bigger tires - just how bad did it hit your mileage? As is, my mileage fluctuates all over. I drive 10 over most everywhere I go, mileage drops in the winter because the engine starts right away to heat the truck, even strong head winds affect my mileage. So...