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Lean burn is different. Civic HX and VX of old, and the current hybrid's ICE, have lean burn. That actually changes the ratio of fuel to air in the mixture. What our R18 does is partially retract some of the charge so that less of the mixture is used. I think it's pretty clear in the second link in my first reply here. Also, calling it VTEC would be incorrect. If you are in a lower load situation from 1000 to 3500RPM, you will probably be in VTEC, but you won't be in this weird thing unless you're in especially low load. At least that is the way I understand it; if they are activated only with each other, I am mistaken.
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