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Meet the Ford EcoBoost engine. Rolling out across its model line over the next five years, EcoBoost engines are downsized engines—V6s instead of V8s and I4s instead of V6s—that produce power comparable to larger engine thanks to direct fuel injection and turbocharging. They also save gas: Ford expects to see 20 percent fuel savings across its model line by 2015.

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By injecting fuel directly into the cylinder, EcoBoost engines create higher rates of compression and therefore squeeze more power out of the same amount of fuel.

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The direct-injection system that Ford uses on EcoBoost engines.

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The other part of the equation: the turbocharger.