Use what's recommended. Anything more is a waste.
The enigine is designed to run best at a certain octane level... 87 for the H3. The H3 can run on a higher octane, it just won't get any additional bennifit from it.
The more important thing to consider is the quality of the gas. Some stations sell cheap gas which may have a high water content or other contamenants. See which station/gas company sells rhe best quality 87 octane gas. You may need to run a couple tanks of it to clean out what the others have left behind.
Has anyone looked into the optimum level of ethynol for the H3? Most stations out here put ethynol in the gas for certain seasons. I see that GM is putting out a new motor which can run on over 80% ethynol.
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