Unless changes are made following review by the Office of Management and Budget, U.S. Tier 2 emissions rules are expected to move cars and trucks together but allow more flexibility than similar standards adopted last year in California. The new rules also reportedly will give automakers a victory on cleaner gasoline, despite objections from the oil industry. They'll also include exceptions that will make it easier for automakers to continue to offer diesel engines, says a source who has ...

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