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I had an 82 Subaru that would get better hwy mpg with higher octane fuel. If I was driving a longer distance I would put in some higher octane gas. I would get 3 to 4 mpg better on the highway. The real help wasn't a reduced cost to drive but I could drive farther between fillups. It didn't make enough difference when driving shorter trips to make it worthwhile. The high compression of the Fit motor might see some benefit from higher octane even if it isn't needed. When I get mine I will try higher octane and see for myself.
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