Originally Posted By: kaboom10
Yep that's the stuff. My sis n law does a ton of city driving and she sees 2 mpg when she uses it.
I might think thats not a reasonable outcome. Maybe if her fuel system was really dirty it would help, but once it had done the needed cleaning one would get the increase in MPG with or without. Its too much of an increase. Its a great gas system cleaner, but if she is buying quality fuel I would nto think PI would give you a 2 MPG increase.