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What's the difference between old and new?
If the discharge spreads out enough over the combustion chamber, allowing for a fuller burn, then 10% is believable, especially as they are noting in that article that the 10% is not solely because of the plugs, but it is because it allows them to run better lean burn and stratified charge.
One question is... would this be a viable substitute for ultra-high pressure direct injection in the implementation of lean-burn? I can imagine that these plugs would cost much more than conventional plugs, but at least the lower costs related to the fuel pump and the (also disposable and pretty expensive) high pressure injectors might make it a more durable and viable option.
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