unfortunately i don't think this quote is terribly useful, since the author didn't specify what additives he actually compared. we know he tried lucas, we know he tried 2-stroke oil, we know he tried atf, and we know he tried biodiesel. but that's it.

so his claim of "the only thing that worked" doesn't mean too much, since we have no idea what else he tried. there are a dozen off the shelf additives, and a dozen more that are mail-order or commercial bulk only.

all we know from this quote is that lucas and 2-stroke are both better than atf, at least when it comes to miles per gallon. and that biodiesel quiets the engine at idle.

anyone ought to guess that conclusion, since both lucas and 2-stroke are designed as fuel additives while atf is not. and everyone who's used bio has reported a quieter engine.

nothing new or insightful here.

this on the other hand is much more methodical and comprehensive.