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I have long since believed that the volume of pollution is far more important than the quality of it. Even when pollution is 100% clean it is still CO2 & CO.
If you get dramatically better FE it simply is not possible to be emitting the same volume of pollution. Each gallon of gas converts into a specific amount of pollution regardless of its cleanliness.
Also studies are showing that sulphur may help with global cooling, maybe sulphur in diesel wasn't a bad idea especially in rural areas where the effect is a little fertalizer and not smog.
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