I have used this additive on several vehicles in the last 2 -3 years.
01 Mazda tribute v6 quietened down the engine a good bit ,smoother ...maybe a .5-1 mpg increase within typical variation IMO.I recently loaned this vehicle to some one who returned it after 4 months with 16 oz of oil in it.I think the "plating/friction reduction treatment may have contributed to the vehicle still being functional.
03 Honda 4 cyl 5 speed a hand me down from the wife averaged about 27 mpg which I thought was low.I used a half bottle of the product after I got the car from the wife and did an o/c.About a month later the wife hopped into the car to go to a restaurant ,she sat there for a second and then asked "what did you do to my car ,it's so quiet." I had not told her about the additive.She requested that whatever I did That i should do to her Honda automatic.The mpg went up to 29 avg after 800-900 miles.
91 Plymouth Acclaim 4 cyl auto(recent acquisition) earlier this week I added a half bottle to the car and did a 180 mile round trip. The engine was quieter at the end of the round trip than at the start.About 300 more miles have been put on the car since then and the engine is a lot smoother and quieter.Which is kind of a drawback as I can now hear every squeak of pulley and belt the old car gives off....lol.I have not had a chance to check the mpg due to the odo not working.
I know many here will call me mistaken ,a liar or delusional..
But I only report my observations.
And based on my experience I feel it works and I will continue to use it.
I will also say that I always add it before going on a long drive,I feel that it gives a better chance for the effects to start building up.
Give it a shot,Rislone has been around for decades with its products so they are not a fly by night company.