On a Kia (or its sister brand, Hyundai), GDI stands for Gasoline Direct Injection. Essentially, it adopts a direct (fuel) injection design, which has numerous benefits when compared to more conventional fuel injection systems. In practice, direct injection is where fuel is supplied directly, straight into the combustion chamber, instead of the intake ports. This allows a GDI-spec engine to more efficiently manage the air-to-fuel ratio. Hence, this results in increased performance, better fuel economy, and a much more versatile engine timing. Moreover, as the fuel is being injected at such high pressures and with minimal pumping and mechanical losses, the driver could more effectively use the engine, even in adverse driving conditions. However, GDI is known to suffer from extensive carbon build-up.