I have read, possibly at the Chevron website in years past, that deposit formation is quite different with unleaded gasoline from what it was with leaded. The information I read said that leaded fuel built up deposits rather quickly, but that the overall deposit levels stabilized after some number of thousands of miles and pretty well stayed there. It went on to say that with unleaded, initial deposit formation was much slower but that the buildup essentially never stopped. This was almost certainly in the '90s sometime, so it should have accounted for detergent-additized gasoline. Has anyone else read this article/information? I cannot find it anymore.