Why are Turbo 4cyl engines Fuel efficient and V6/V8 Turbo’d engines not equivalent or better?

Question

Why are Turbo 4cyl engines Fuel efficient and V6/V8 Turbo’d engines not equivalent or better?

In: 5

Answer 1

Because turbocharging an engine doesn’t change the fact that a 6 or 8 cylinder engine has more cylinders than a 4 cylinder engine. Since each cylinder uses a certain amount of fuel, more cylinders means less fuel efficient.

There have been attempts to solve that issue by inventing engines that have 8 cylinders but can run on 4 cylinders normally, only activating additional cylinders if needed for more power.