Automakers and environmentalists are hoping a new Health Effects Institute (HEI) report will help convince the US Environmental Protection Agency to more strictly regulate, or possibly even ban, the octane enhancer methylcyclopentadienyl manganese tricarbonyl (MMT).EPA, automakers, and oil companies jointly sponsor HEI; the Boston-based group was created in 1980 to study the health impacts of motor vehicle pollution.MMT is a manganese-based fuel additive used in Canada but rarely found in the US. EPA allows it in conventional gasoline at a level of 1/32 g/gal manganese, but the product is now in only 0.3% of the US gasoline pool.MMT's sole manufacturer, Richmond, Va.-based Ethyl Corp....

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