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The long-standing joint venture between Cummins Inc. and Westport Fuel Systems Inc. for the manufacture of natural gas engines is nearing a turning point, with the companies and industry observers discussing what lies ahead both for the partners and for natural gas technology.

The U.S. average retail price of a gallon of diesel rose 2.8 cents to $3.069 a gallon, the Department of Energy reported Dec. 30.

Years of planning and preparation by the ocean shipping, oil and trucking industries are set to pay off as adequate supplies of diesel fuel are expected to be ready now that an International Maritime Organization mandate for the use of lower polluting fuel on ocean vessels is about to take effect.

Oil rose for a fifth session, the longest run of gains since July, as a bigger-than-forecast decline in U.S. crude stockpiles eased oversupply concerns.

ANKARA, Turkey — Turkish President Recep Tayyip Erdogan on Dec. 27 unveiled prototypes of a domestically produced electric car, putting him closer to fulfilling a long-held dream of building Turkey’s first “national” automobile.

FRANKFURT, Germany — Automaker Volkswagen is accelerating its move into battery-powered cars, saying it will reach its goal of 1 million electric cars per year two years earlier than planned.

General Motors Co. and Tesla are about to become the first automakers that will have to sell EVs without the benefit of a $7,500 federal tax credit.

The day Youngstown’s steel mills began shutting down 40 years ago remains fresh in the minds of those who live in the blue-collar corner of Ohio. Community leaders don’t want the recent closing of General Motors’ massive assembly plant to leave that same lingering gloom.

Tolls on motorists entering midtown Manhattan promise to alter everyday life for millions of people in the most populous U.S. city. Yet with the fees slated to begin in a year, the panel empowered to set pricing and other policies has yet to be created.

The U.S. average retail price of diesel dipped 0.5 cent to $3.041 a gallon, the Department of Energy reported Dec. 23.