Would it be beneficial at all (as regards lean burn and rate of flame propagation) to have two spark plugs, one charged with a high positive voltage, one charged with a high negative voltage, such that the spark jumps between the two plugs? My thinking (which is probably wrong, as it often is) is it'd greatly expand the cross-sectional area of fuel and air exposed to the hot spark, providing a much larger initial flame front (so it'd finish burning faster because more of it is burning at the start), and would almost certainly make it difficult for cylinder misfires to occur. Hence, one could lean the mix and retard the timing by doing so. Perhaps use water mist injection to prevent NOx emissions by lowering combustion temperature below where NOx is created. But I'm just a mechanic and grease monkey... I'd like to hear from those who've got the academic background to understand exactly what the ramifications of such a setup would be. Thanks.