American drivers notice soaring gas prices. But another fuel – diesel – is also on the rise, and at a much faster pace.

A band wagon powered by natural gas seems to have begun rolling, but most of those aboard talk about brand-new heavy trucks with special gas-burning engines. Why not convert existing trucks and ...

What makes a diesel engine different to a regular gas engine, and is one better than the other?

Normal-sized diesel-powered cars capture a significant foothold in a huge market outside the U.S., here’s why.