Everyone who knows anything about engines knows a V8 is a fast, powerful, gas guzzler, and a four-cylinder is slower, less powerful and more fuel efficient.Well, everything you think you know about engines has changed.Gasoline direct injection (GDI) has made fuel-efficient muscle cars a thing.Pair an efficient four cylinder with a power-boosting device like a turbo, and run it like a diesel, with the injectors firing directly into the combustion chamber and you have a market-changing automobile.In its first seven years on the market, the GDI engine grew from insignificant to powering 38 percent of all cars sold. Six
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