I have a 2017 5.7 with Dodge cold air intake with the PC. Drive mine a lot in city mode or sport mode. I get 21 to 22 mpg. That is driving up and over hills and back roads. I was getting around 20 mpg without the PC, so I guess I have been lucky. Yes, had it on Sport 4+ the other day at a red light and stomped it........truck went crazy sideways......hooked up to the pavement and went like a missle down the road. If you are a lead foot a PC might be hard to control. It is a lot of fun. Thank you Nick@got exhaust.