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EFI simply states that it's a fuel-injected engine( as opposed to a carburetor set up), and that's the fuel injection is controlled by electronics rather than by a mechanic fuel pump. GDI tells you that not only do you have a fuel-injected engine, but that the injectors are sitting closer to the combustion chambers(maybe even inside) which supposedly is good for fuel consumption and a clean burn.

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Q: What is the difference between an EFI engine and a GDI engine?
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