I will be providing feedback as my order goes in on Monday [emoji16]. I have their system in my Camaro. City driving I didn’t really see any real change in gas mileage (don’t care). Highway comparing two long trips (1 being the same route Indy to Bowling Green), with the roto-fab I seen a 1 mpg gain (23 to 24 mpg). Can’t wait to get mine [emoji1360] Sent from my iPad using Tapatalk Pro