The Obama administration will seek tougher fuel-economy standards for the nation’s heavy trucks and buses as part of its expanded effort to cut down on pollutants blamed for the warming of the planet.

A proposed regulation would phase in higher efficiency requirements for heavy-duty engines beginning in the model year 2021, eventually leading to a 24 percent improvement in mileage compared with similar vehicles built to meet today’s standards.

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Earthgarage – Greener Car. Fatter Wallet.