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The problem is, you can't compare an X-NA to an X-Turbo engine. The X-Turbo engine, granted, will never get the exact same efficiency as the X-NA version. Even if you tried to completely bypass the turbo, you're introducing a more convoluted exhaust path that robs it of power (compared to the smoother flow on newer NA engines) and which causes lag and driveability issues. And that's not taking into account the intake path, which would have to also bypass the turbo unit completely.
Then there's the higher pressure fuel rail, the bigger injectors, the stronger clutch and drivetrain, all that extra weight, the need for a richer air-fuel mixture to prevent detonation, the lower compression versus NA variants, etcetera, etcetera, etcetera.
In the end, that X-Turbo engine is meant to replace a Y-NA motor that's bigger and... theoretically... less fuel efficient. Comparing it to the X-NA is comparing apples to oranges.
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