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IIRC it's still enforced only against older vehicles classified within less stringent emission rules, but it still doesn't seem to be a great idea at all. Pouring some vegetable oil in the tank of an old Diesel jalopy with indirect injection is a far more sensible option than wasting otherwise good cars while spending an awful amount of energy (usually not from the cleanest source) to make a replacement which would be not just more expensive but also less suitable to some alternate fuels.
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