I began my day at 149,747 miles on the odometer of my 2015 Malibu LTZ by the time I hit the highway for the first part of my cruise I noticed an increase in my acceleration and she wanted to practically launch herself, what can I say, I wanted more! I took her to 80mph and maybe a little more (truth be told, if she came with a flux capacitor I would have gone back to see the Declaration of Independence signed!) So I exited the highway and set myself a little north so I could feel how she would run through the Berkshire Mountains !!! She honestly ran like she did 3 years and almost 100K miles ago, felt like I was back in 2016/2017 again! Thank you, this is such a great product!