Vehicle emissions testing remains one of the primary tools used across the United States to reduce air pollution, but the ...

EPA's relaxed NOx rule, as many expected, removes the warranty extension—and proposes annihilating the troublesome DEF derate ...

The U.S. Environmental Protection Agency ​on Thursday proposed ‌easing heavy-truck and engine emissions rules adopted ​under Democratic President Joe ​Biden in 2023.

Cummins and PACCAR are updating diesel engine software to give operators more time to address certain DEF-related issues ...

Time flies and January 1, 2027, will be here soon, bringing with it a new round of emissions-reduction requirements and a series of very clean-burning diesels. They will be more complex and expensive ...

Mazda spent a decade fighting for diesel in America — and by the time it arrived, the market had already moved on.

Your car's dashboard is trying to talk to you, and most of us respond the way we do to a group chat we've muted: total ...

Rachel Reeves has given the green light to new VAT rates for newer petrol and diesel cars. HM Treasury, which acts under Chancellor Ms Reeves, has introduced new VAT road fuel scale charges. The ...