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I have found that heating gasoline to 180 deg. F yields about a 10% return improvement in fuel economy. Detonation threshold seems about the same for a given octane value. Greater tendency to vapor lock during hot restart. Most OBII ecu s have the ability to recognize this condition and will keep injectors closed until engine restarts. May take 2 or 3 tries but it will fire up. Heating intake air also improves fuel economy but I have found a greater tendency to go into detonation especially when ambient temps. go above 60 deg F. If you run a dedicated water or water/methanol system you can effectively supress detonation with even the lowest octane fuel.
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