The phrase "in heavier use" is correct and can be used in written English.
It typically means that something is being used more frequently or more intensely than before. Example: With the rise of social media, traditional forms of advertising have been in heavier use in recent years to reach a larger audience.
The net result would also be lower prices for consumers, which may result in heavier use and the rise of new usage types.
Although, Great Gobi B SPA contains large tracts of habitat comparable to Great Gobi A SPA (von Wehrden et al., 2009), its higher overall productivity results in heavier use by humans and their livestock (Kaczensky et al., 2007) and consequently a much higher disturbance potential.
Regardless of whether the groups are compared at a common level of ATP production, at a common O2 consumption, or whether each group is simulated at its own minimum feasible oxygen uptake, there were clear differences in glycolytic flux and pyruvate carboxylase activity, resulting in heavier use of Complex I and increased ATP generating efficiency in the adapted flies.
Public relations filters have been in heavy use since the site went up.
Incandescent bulbs, once a bright idea, are obsolete yet still in heavy use.
Sikorsky is perhaps best known as maker of the Black Hawk helicopter, a military war horse that is in heavy use in Iraq.
Humphreys noted that research has shown that overall increases in use tend to stem from increases in heavy use by individuals.
These paths remain in heavy use by shepherds, farmers and, lately, foreign hikers, who have discovered in La Gomera a mother lode of good, challenging trails.
We all knew that these were in heavy use, but one of the things I was curious about was how the industry was wrestling with the issue.
And although he lives alone, an assortment of friends, business associates and people he's met on book tours keep his five guestrooms in heavy use.
Still, when used with tapes, the backup program sternly warns that "formatting may fail if your computer is in heavy use," the sort of thing that simply should not happen with a truly multitasking operating system.
