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Daimler AG’s truck division, the world’s biggest truck maker, said spending on a global presence will help it fend off competition from a manufacturing alliance Volkswagen AG is forming with Scania AB and MAN SE.

DETROIT — Detroit Diesel Corp. announced a series of enhancements to its 2013 Detroit heavy-duty truck engines that are designed to improve their fuel efficiency and reduce the cost of running and maintaining them.

OXON HILL, Md. — Expressing some skepticism about the near-term strength of the market for natural-gas engines in heavy-duty trucks, Daimler Trucks’ chief U.S. executive said the truck maker will continue using Cummins Inc. engines rather than developing its own natural-gas power plants.    

CHENNAI, India — The world’s largest commercial vehicle maker, Daimler AG, is making one of its biggest-ever bets by pouring $850 million into production and sales operations here, in what is now the world’s fastest-growing market for trucks and buses.

LAS VEGAS — Executives at Western Star Trucks, Daimler AG’s North American niche brand, want to boost U.S. heavy-duty market share toward the 3% level from its current neighborhood of 1.2%, hoping that its new 4700 and another model to come will increase sales toward that level.

Daimler AG plans to increase its stake in Russia’s largest truck maker as part of its target of a 64% rise in truck sales by the end of the decade, Bloomberg reported Monday.

NASHVILLE, Tenn. — Martin Daum, president of Daimler Trucks North America, said the company’s previously announced layoffs at its production facilities will be “significantly lower” than the 1,300 jobs it had projected earlier this year.