Reviewed By Edgar S (COCKEYSVILLE, MD) Reviewed for a 2007 GMC Yukon —9/8/2016 12:18 AM
I put this unit on Denali with the hope of getting a little more mileage. Well, I was pleasantly surprised. So far I have only driven locally with a combination of city and a little highway driving. I can realistically say I have seen a 2-3 MPG increase. I have a long trip planned in the very near future and can't wait to see the increase in MPG I will get with mostly highway driving. 3-4, possibly a 5 MPG increase would not surprise me. Additionally, I can feel a small increase in power.