Nissan Motor Co. has come up with a new type of gasoline engine that it says may make some advanced diesel engines obsolete. The new engine uses variable compression technology, which Nissan engineers ...

Last in a three-part series The auto industry has work ahead to meet ambitious fuel efficiency goals of 55 mpg by 2025 — nearly twice the current average required. Hybrid and electric cars will play a ...

Automobile engines have undergone tons of changes over the years, primarily to make them more efficient. For the most part though, engine changes result from a string of iterative improvements on ...