Quote:
Originally Posted by California98Civic
There was also an extensive and informed debate about CAT temps and overall vehicle pollution on this site a couple years ago. Search for it. One point I would revive is pollution from a vehicle is not just about the fuel's point of use: all your fuel is shipped on intensely polluting ocean super tankers. Higher MPG through P&G boosts emissions if the cat is allowed to get cold, but higher MPG also means less business for those massively polluting tankers.
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I haven't read the thread, but that's an excellent point. There's definitely a problem with emissions testing methodology when it looks at PPM and not the actual amount of pollution.