These hulking diesel engines power the economy with massive torque, hundreds of horsepower, and hard-driving reliability.

Some semi-trucks have two giant silver cylinders on their sides, but others don't. Here's why that is, and what exactly those ...

A semi truck diesel engine's exhaust isn't just noisy ... The rules also prohibit exhaust from venting directly beneath or in front of the driver's compartment, or in areas where it could ...

PepsiCo says it has converted engines in 20 semi trucks traveling Iowa so it can use 99% biodiesel and cut carbon emissions.

Up front is the regular diesel tractor. Just behind it ... your mileage is definitely going to vary.Federal law limits each semi truck to 80,000 pounds gross. The Revoy module, whatever it ...

“When we talk scale, we're talking big scale,” Priestley noted in front of a packed ... For starters, the Tesla Semi is closer to parity with diesel trucks than other electric offerings.

Their trailers—known as tractor-trailers—have no front ... truck is connected, and pressure from the truck’s engine-powered air pump releases the brakes, can the trailer roll. Thus: “semi ...

After reserving a Tesla semi truck and waiting five years ... to stop to charge along the route, as it has a diesel generator under the front shell. Contrary to what I thought before going ...