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Additives (at this very small %) in the fuel are not going to do anything for the longevity of the engine. What is possible is lubricating the fuel system.
I have used several additives: Seafoam, MMO, Techron, TCW3, Lucas Oil. I can't say I prefer one over another, but I have been buying MMO lately.
While i had the car, I noticed a marked improvement in engine crank/start time. Likely due to higher fuel pressure from a lubricated fuel pump and/or cleaner injectors. The car had over 200k miles at the time.
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