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The phrase "are much more 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 better than the others.
Example: "Electric cars are much more efficient than traditional gasoline vehicles in terms of energy consumption."
Alternatives: "are significantly more efficient" or "are far more efficient."
Exact(59)
"Fluorescent lights are much more efficient.
"We are much more efficient than anyone before could be".
And those small-scale, independent businesses are much more efficient at reuse than their manufacturing counterparts.
Internet businesses are much more efficient than brick-and-mortar companies.
They are much more efficient, and that has to do with intense competition from Liverpool".
In both countries plants belonging to multinationals are much more efficient than their rivals.
"Transistors of this type," Dr. Shockley said, "are much more efficient than the older type and consume far less power".
"While we are much more efficient in producing quality journalism, we still have a way to go.
Because we are a pure on-demand product, we are much more efficient at finding an audience for that show".
"This has been a real win-win project, because not only do the houses look better, but also they are much more efficient".
"And the companies likely to buy a Grand Union are much more efficient and have much lower prices on everyday shelf items".
More suggestions(16)
are much more successful
are considerably more efficient
are much more proficient
are substantially more efficient
are much more profitable
are much more functional
are far more efficient
are significantly more efficient
are much more streamlined
are much more affluent
are much more sporadic
are much more secure
are much more modest
are much more expensive
are much more significant
are much more proactive
Write better and faster with AI suggestions while staying true to your unique style.
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