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If your car fails emissions testing because too much driving in lower rpms has partially clogged the cat, you only need to drive it for a mile or two in very high revvs and it will pass the testing.
But you are correct about emissions, coasting in neutral is a lot less polluting and so are OBD-II cars. And I`m not arguing here, the numbers are on the side of newer cars and that`s a fact.
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