I get 30~32 MPG with 87 Octane fuel on my 3.4L V6 03 Impala at 70 MPH on the Hwy. With factory all, cruise control on and AC. It comes with a factory cold intake, is not a shiny metal tube but a plastic one with an air box that has an intake behind the driver side headlight. And the best of it is "free", it came with the car.