MotorTrend revisits its landmark 2004 comparison of the Toyota Prius, Honda Civic Hybrid, Honda Insight, and first-generation ...

Environmental advocates worry the plan could add to the persistent ozone struggle along Colorado’s Front Range. The complex ...

Diesel engines still have their place in the modern automotive world, but they're not without flaws, one of the major ones ...

On July 3, 2026, President Trump pardoned early a dozen people who were convicted under the Clean Air Act for tampering with ...

Wyoming's most famous diesel “delete" mechanic Troy Lake, who was pardoned by Trump after a prison stint, advocated for the ...

These engines may be old, but they can still pack a punch ...

Petrol and diesel drivers across the UK are being hit with new VAT rates following a 2026 update by HM Revenue and Customs ...

You can reduce your diesel engine’s emissions by 60% with THIS surprisingly simple solution—just add water. In all seriousness, according to a review of studies from around the world published by a ...

A global review finds that water-in-diesel emulsion can slash NOx and soot at the same time, offering a cheaper path to cleaner diesel engines.

What is the difference between Tier 3 and Tier 4 diesel engines? We explain EPA nonroad emissions standards, DPF, SCR, and ...

Heavy-duty truck equipment managers are heading toward another major emissions milestone, and the questions are familiar: What changes under the hood? What happens to fuel economy? Will the ...

Detroit Diesel’s two-stroke engines used a firing cycle and Roots blower to create the legendary Screaming Jimmy sound that ...