Originally Posted by Mattk
Fuel consumption is only part of pollution control. A better solution would be to compel makers to install better exhaust systems. That hurts performance, but it's far less restrictive, and much more effective and reducing emissions. That said, cars contribute so little to global pollution that it's not really worth it.
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with modern Cat's, there is literally nearly zero pollutants coming out of the exhaust. I could debate that C02 is not a pollutant quite easily.