Penton’s WardsAuto has named three diesels, a tiny 3-cyl. turbo and a battery-electric vehicle to its annual 2014 Ward’s 10 Best Engines, illustrating the importance of fuel economy as automakers develop and market advanced new powertrains.

This is the 20th year for Ward’s 10 Best Engines, a competition created to recognize outstanding powertrain achievement, world-class technologies and those rare engines or electric propulsion systems that are so compelling they help sell the vehicle.