Please excuse my naive-ness but what is ETOH?

I understood that the higher octane would not increase fuel mileage and may have a very slight negative effect, but I was thinking the longevity of the engine, long term cleanliness. I plan to own this vehicle a very long time, unless the next generation in about 6 years makes huge leaps in fuel economy beyond what my level will be and would still keep it as a supplemental car then as well. If higher octane will cause problems as you stated that someone else lost three engines from it, well, that will definately put me more towards NEVER using a higher octane unless it is the ONLY option where I am filling up.

So ... what would be a good fuel system cleaner and how often to use it to keep things cleaner in the long run and not harm any components. I have thought about writing Honda and asking what they felt would be the best maintainance for all systems, but thought that would not be something they would give a lot of time to respond to. Also, what other things can I do to increase the life of my car other than following the procedures in the manual. I have always had (very) used cars and try to rehabilitate them. It is nice to not have those problems or worries and plan to keep it that way.

I think I will take the advice and switch back and forth between a couple brands, seems like a logical thing now that I think about it. If they use different additives, that have different properties, then you get the benefit of all of them.