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There's a new diesel additive called Envirox that uses cerium oxide as a catalyst. That's the same metal that supports more efficient and expensive platinum in catalytic converters. A company spun off from the University of Oxford called Oxonica has discovered that by breaking the cerium down into nanoparticles of just 5 to 25 nanometers in diameter, the metal turns into a highly active catalyst and can be blended directly into fuel. The result reportedly boosts fuel efficiency five percent and