What has turned the lowly four-banger into such a ready replacement for its bigger brethren is the widespread use of turbo-charging and direct fuel injection.

卑微的四缸引擎能如此迅速地替代其他更多缸数的引擎的原因是废气涡轮增压和燃油直喷技术的广泛使用。

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With only 133 horsepower coming from its 1.8-liter four-banger, the MG6's power won't set the world on fire either.

凭借来自1.8 L四汽缸发动机的仅仅133匹马力，MG6的功率还不足以征服世界。

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The Mazda5's 2.5-liter, 157-horsepower four-banger and five-speed automatic transmission are serviceable, but there's more exertion than passion underfoot here.

WSJ: 2012 Mazda5 Review: Yes to Convenience, No to Bloat | Rumble Seat by Dan Neil

The Ford chassis engineers have so outclassed the powertrain a 2.0-liter, direct-injection four-banger with 160 horsepower and 146 pound-feet of torque, and that at a cringe-y 4, 450 rpm that you can't help but walk away feeling that the car is woefully underpowered.

WSJ: 2012 Focus Titanium Sedan: A Stab at a European Sport Sedan��From Ford | Rumble Seat by Dan Neil