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Thank you for the clarification.
As an aside, I hardly care what the emissions are on big rigs. 85% of their miles (you'll correct my wild guess) is out in the middle of nowhere. If they can get 5% better fuel economy at the expense of particulate emissions, seems like a good tradeoff to me.
Perhaps the ultimate would be location sensitive emissions. No urea injection and particulate filtering in the middle of nowhere Wyoming, but full controls in gridlock traffic on the 405 in LA.
I'm not against emission control schemes, only against them when they don't matter.
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