Mercedes calls their Mild Hybrid technology "EQ Boost", but don't let the term 'mild' fool you — this hybrid system is built to perform.

One of its applications is the Mercedes-Benz M256 powerplant: a 3-litre straight-six turbocharged gasoline designed specifically to be electrified. I've now logged about 6,000 testing kilometres with this engine in 3 different E-Class models over the past year or so. The most recent of these was the E-Class Sedan.

On its own, the configuration of M256 engine used by my tester develops 362 horsepower and 369 pound-feet of torque. Further power is added by the EQ Boost system, which uses electricity to spice things up by adding a 21-horsepower boost, cranking up low-end torque, and saving fuel in the process.

Learn how it works at https://driving.ca/?p=476102