For right now, we will atleast say my average mpg is on the rise.
My lifetime (started tracking fuel 1/1/24) mpg before catalyst was 6.62. Only 15 days into use, mpg has already risen to 6.68 mpg. I can tell better after 75 more days of use. I am regional, so pretty much always run the same routes daily.
As far as anything else, my truck seems to run the same and idles a slight rough still. So we will see.
Of course, seeing the product name, I Totally forgot I ordered this with a spout. The spout did not show. Pouring the catalyst out of the bottle, into a funnel, still leaves a mess. The bottle is not designed for slow Pouring. Too bad I waited so long for the review, I guess I will order the spout again next time, so I can try it out.