Carmakers have warned current fuel-efficiency standards "present a challenge" before the release of the latest targets from National Highway Traffic Safety Administration and US Environmental Protection Agency. "The one national program was an aspirational goal, and we don't have it," said Bozzella. The new rules will be implemented in stages over five years, starting with an initial phase that starts on 1 January 2018. Environmentalists argue the standards are "technologically attainable".
Carmakers have warned current fuel-efficiency standards "present a challenge" before the release of the latest targets from National Highway Traffic Safety Administration and US Environmental Protection Agency. The new rules will be implemented in stages over five years, starting with an initial phase that starts on 1 January 2018. Environmentalists argue the standards are "technologically attainable".