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I read an article once, don't remember the source, but it was discussing fuel vapor explosions, military/goverment document of some sort. They discussed a range of 1.3% - 6.25% fuel to air ratios are explosive. 15:1 air:fuel is about 6.25% (richest in their range) and 75:1 air:fuel is about 1.315% (leanest in their range). So, is it possible to run leaner, I would have to say yes for sure, but how much is the question. Not sure what raising the temps and pressures due to these numbers, as their discussion was on fuel vapor clouds in the air, so room temperature and atmosheric pressure.
Just some fuel for thought. Enjoy JoJo
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