I didn't see anyone talking about this. I picked up a bottle of this off the shelf. On the website no pictures of the back are shown, and I couldn't even find a SDS for in Oreilly's system. However the search results claim it to be a Lucas product. Here is the blurb on the back, which I found very interesting: Removes carbon deposits from blah blah blah... Cleans the entire fuel system blah blah blah... A comprehensive fuel treatment. Contains PIB amine and PEA detergents. Use every 5000 miles 12oz, treats up to 20 gallons. I haven't heard PIB mentioned in regards to fuel system cleaners. I would guess that this means Poly-iso-butane (butene?) which is a component of 2-stroke oils as many are fond of putting in their gas. Not sure about the amine part though. But perhaps there is no connection at all. That part got me thinking. Supposedly PEA only works gradually, so if people notice an immediate improvement, then why couldn't it be the mineral oil or other parts of the fuel additive acting as a UCL like the 2-stroke oil? In which case, if one really wants to know if a fuel treatment is effective maybe it makes more sense to use a UCL and then switch to the PEA fuel system cleaner so that the change in cylinder lubrication is less likely to be a confounder.