The Environmental Protection Agency's proposed Tier 3 sulfur-reduction rules for cars and gasoline would adopt E15 as an emissions test fuel. The proposed shift to E15, from indolene, is meant to "better match today's in-use gasoline and also to be forward-looking with respect to future ethanol and sulfur content," the agency said. Moreover, the EPA is proposing the use of E85 as an emissions test fuel to certify flex-fuel vehicles and may allow automakers to use alternative test fuels such as E30.

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