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The phrase "are much less efficient" is correct and usable in written English.
You can use it when comparing the efficiency of two or more things, indicating that one is significantly less efficient than the other.
Example: "The new system is more user-friendly, but it are much less efficient than the previous version."
Alternatives: "are significantly less effective" or "are considerably less productive."
Exact(29)
Batteries are much less efficient.
But they are much less efficient.
Additionally they work longer hours than their German and British counterparts, but are much less efficient.
Without visualization, we are much less efficient in getting to the questions whose answers teach us something.
Housing markets, moreover, are much less efficient than the stock market, so buyers can probably get good deals if they try.
It turns out that private plans are much less efficient than the government at providing health insurance because they have much higher overhead.
Similar(31)
The specialization of being able to feed on particular diets especially efficiently often comes at the cost of being much less efficient when dealing with alternative diets.
Ethyl 2-bromopropionate was much less efficient.
Multiple linear regression proved to be much less efficient.
Rayleigh scattering by air molecules is much less efficient than fluorescence by alkaline atoms.
Plasma carboxypeptidase N, generally regarded as the physiological regulator of kinins, was much less efficient than TAFIa.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com