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As to claims of better performance and lower fuel consumption: EFI systems inject fuel according to the amount of air drawn into the engine, measured with its sensors. More performance can only be had if more air/fuel enters the engine. No electrical system can increase the air-flow, so no more fuel flow either. The only effect a better grounding system can have is if the sensor grounding was so bad before that the EFI computer misread the sensors due to ground offsets. This can be inexpensively remedied by following the grounding guidelines above. Some of the better EFI computers utilize 'differential' inputs. They measure both, the signal and the ground of the sensor itself and calculate the difference. This way they become independent of any grounding issues.