I bought it back in 08. It was a race pipe built by an indivdual on one of the fourms. The mileage i stated was hand calculated when driven normaly. I have seen my City mileage drop to 13-14 mpg in stop and go traffic. And I'm
running 3:73 gears.
I have an 08 with a 8" lift on 37s. Stock i was getting 11mpg city and 12 Hwy. After Dpf Delete and Spartin 275 tune and S&B CAI. I'm now getting 16mpg city and 18mpg Hwy.