by Robert Sanborn on Tue, May 30, 2006, who was a member of the STLE Society of Tribologists and Lubrication Engineers for 15 years.
I changed my oil two weeks ago and added the SFR oil treatment and gas treatment. I drove 583 miles, filled up and then calculated that I had achieved 31 mpg. I was getting 28-29 previously. Not bad for a vehicle that has 196860 miles on it! From: Robert Mortensen, Harrisonberg, VA