Watching Government: Additive wars

A utomakers last month said they are worried that US refiners may expand their use of the octane-enhancer MMT. MMT, known by chemists as methylcyclopentadienyl manganese tricarbonyl, is a manganese-based fuel additive used often in Canada but rarely in the US.Complying with a 1996 court order, the US Environmental Protection Agency allowed MMT back in the US conventional gasoline market after a 2-decade absence. Automakers said a new multiyear, $8 million study shows MMT can increase smog, reduce fuel economy, increase greenhouse gas emissions, and cause low-emission vehicles to fail hydrocarbon-emission standards. Automakers compiled data from 14 vehicle models built by six manufacturers...

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