I'm about as knowledgeable in this area as a teenager with a learners permit. That said, I know that everyone has varying opinions ranging from "pure snake oil and a waste of money" to "scientifically proven to increase horsepower and gas mileage." I did a Google search and it seems like the consistent top choices are BG 44k, Techron, Redline and Royal Purple. Of course, those could be biased based on sponsorships, etc.. LiquiMoly also got high ratings, but was not necessarily chosen as a "top choice," as were several others. So with that being said, what are your thoughts on fuel additives whether your intended purpose is to improve gas mileage, clean injectors, clean the combustion chamber, or whatever?