Four heavy heavy-duty diesel engines will also be evaluated: the Caterpillar C15, Cummins ISX, Volvo D13 and DDC Series 60," and more engines may be added to the benchmark later.

Toyota's truck unit Hino Motors will pay a total of $1.6 billion to resolve claims that it falsified fuel-consumption and emissions data for heavy-duty diesel engines, the U.S. Justice Department ...