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I have a 2015 f150. It has a 3.31 gears in it. It had 30" tires (265/60/18) I have 33.4 (305/55/20 on now. Lost around 2 to 2.5 mpg. Thinking about swapping to 4.10. Wondering if anyone has done this and what is the out come? Sent from my iPhone using the svtperformance.com mobile app