GDI engines vs Ported Fuel Injection. Which one is better? . Well, that depends on what you're looking for. GDI engines are known for their high performance and fuel efficiency, but they can also be more prone to carbon buildup and require more maintenance. PFI engines offer lower emissions and less noise, but can be less efficient but how much efficiency are we loosing, is it noticeable. Am I a race car driver or amI just needing reliable low cost transportation. That’s the real question here.

Understanding GDI Engines: How Direct Injection Works