Several auto maker organizations are proposing the banning of manganese-based gasoline additive MMT, saying it poses long-term problems for vehicle-fuel and emissions systems. Canadian Vehicle Manufacturers Assn. President Mark Nantais says the additive should be eliminated from gasoline in order to optimize emissions and fuel economy over the life of all light-duty vehicles. Industry sources tell Ward's that auto maker warranty costs for MMT-related degradation of emissions ...

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