Ronald Kim Lund
I drive a 1999 W900 Kenworth with a c-15 Caterpillar engine...I had specific mileage pretreatment of 6.34, 5.01 and 4.52 for an average of 5.29 MPG. Post treatment I had 7.02, 5.41 and 7.02 for an average of 6.48 MPG. This is an 11% increase on average. I also felt a noticeable increase in power during climbing. My engine runs smoother and doesn't have the acceleration hesitation that is has had in the past.