Why Modern Diesel Engines Dominate Sales in Heavy-Duty Trucks: Unveiling the Advantages

Diesel trucks have a rich history that dates back to 1923. Karl Benz’s company created the first diesel truck, and today, diesel continues to lead in heavy-duty trucks. Despite the downfall of diesel cars, diesel-powered trucks remain strong in the market. According to recent data from HDT, around 76% of heavy-duty trucks on U.S. roads use diesel, while only 22% run on gasoline. Electric trucks are slowly growing, but they currently make up just 1% of the heavy-duty fleet.

Why is diesel so popular for heavy-duty trucks? First, diesel fuel packs more energy than gasoline. This means diesel engines can generate more power. For example, a 2025 Ford F-350’s diesel engine can produce a massive 1,200 lb-ft of torque, allowing it to tow up to 40,000 lbs. In contrast, the most powerful gasoline engine in the same truck only offers 485 lb-ft of torque.

Diesel engines tend to be more durable too. They are built to withstand higher pressures, making them last longer under tough conditions. Moreover, a study by Car and Driver noted that diesel trucks generally achieve 20% better fuel economy at highway speeds compared to their gasoline counterparts.

However, diesel isn’t without its downsides. The initial cost is higher, and running a diesel engine can be more expensive, especially with recent spikes in diesel fuel prices. These engines require more oil changes and regular additions of diesel exhaust fluid (DEF).

Another critical issue is emissions. While DEF reduces some harmful gases, diesel engines still emit significant pollutants. An alarming report from the American Lung Association states that heavy-duty vehicles make up only 6% of the on-road fleet but produce 59% of nitrogen-oxide emissions. The Clean Air Task Force found that these emissions can lead to thousands of deaths and serious health issues, amounting to about $100 billion in health-related damages in 2023.

Despite ongoing discussions about cleaner alternatives, diesel trucks hold their ground for now. As environmental concerns grow, the future of heavy-duty trucking may hinge on regulations and advancements in electric and hybrid technologies.