Mercedes-AMG is no stranger to high-performance I4 powertrains. Remember the 176-series A-Class with its AMG-specific M133 inline-four turbo monster of an engine? Also used by the CLA 45 and GLA 45, ...

How Dual Volute Turbos Work In Chevy's Massive Four-Cylinder Engine Chevy’s 2.7L I4 engine is one of the largest gasoline four cylinders sold today in a road car. It’s packed with clever technology, ...

Taking all that in, some may conclude that the premium fuel may account for the horsepower difference. However, the real reason is a bit more nuanced. We reached out to General Motors for details on ...

At TopSpeed, William Clavey is Editor-at-Large, where he focuses on authority and exclusive content, reviews, news articles, features, and opinion pieces all while sharing his passion for everything ...