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Lean burn is only useful at low loads because it increases chance of knock. Ideally you'd want compression to be at the very edge of safety at stoich at your max RPM, and then have the burn lean out gradually as load and RPM drop, but I'm not sure where ignition timing falls into this.
I wonder what's more effective, leaning the burn or advancing timing? It would be interesting to see a graph showing the FE increases of both.
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