GREENVILLE, SC. Changes may be afoot as to the types of testing protocols used to certify heavy trucks and related components to the greenhouse gas emission and fuel economy standards put in place by the Environment Protection Agency (EPA) and National Highway Traffic Safety Administration (NHTSA) several years ago. “The EPA is discussing the use of coast down testing, wind tunnel testing, and CFD [computational fluid dynamics] for OEMs to meet the greenhouse gas regulations,” ...

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