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Thank you for this thread! It got me thinking and my thoughts went to some new places. I have experienced the benefit of a more powerful expansion medium. Running lean like you are may just be "adding more expansion medium". We know that at 14.7:1 the exhaust is as hot as it gets. When you go lean from stoic the exhaust (and combustion temps) get cooler. This has to mean that more of the thermal energy is converted to pressure.
In short, I believe your extremely lean AFRs are adding more expansion medium to absorb the heat of combustion, wasting less out the exhaust (or coolant passages).
As for compensating for the slower flame propagation, as already mentioned, HHO works. I've also had excellent results with ozone. Both have maintenance issues, though. HHO systems require water refills and periodic cleaning. The most common method of generating ozone is with dielectric plates. They corrode and require frequent cleaning.
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Recovering Gasaholic
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