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When you go that lean on a modern engine your NOX skyrockets. It's the same reason Honda stopped making the VX. Sadly when the govt makes absolute levels of emissions that can not be individually violated by even a very small percentage, then many innovations are never implemented. Had govt made emissions a combination of the individual components with variations that might individually exceed desired levels, then many improvements would have been allowed to continue development and the progress of economy and fuel delivery strategies could have taken a radically different course.
regards
mech
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