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Air/fuel mass ratio. Meaning: for any given amount of air you need 1/65th of that amount in fuel mixed with the air to fully combust the mixture. This isn't a constant for any engine (as temperatures vary).
That was awesome. Honda is solving so many issues with internal combustion, they show up late with some things but they really make a difference. Now let's see it in an application that is purely designed for performance. It's too bad you can't have the hemi spark plug head with that system though. But I guess that trade off is worth it.