Re: top tier gasoline
I wouldn't use higher octane gas than necessary, nor would I use third party additives unless I knew there was a real problem with the local fuel supply. Honda warns of a certain type of additive that shouldn't be used, but unless they recommend using certain additives or using higher octane gas I don't think it's a wise precautionary step. Gas stations have marketed their "mid-grade" and "top-grade" gasolines as if they have magical cleaning properties, implying that the 87 octane doesn't have it, but that's not the case... it's just marketing hype, also you'll get better fuel economy using 87 octane if you car is designed to run on that, higher octane fuels contain less energy per volume.
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