This looks kinda high but perhaps not as uncommon due to your vehicle's mileage/age.
For context my 2010 FD2 goes for about 220-270km on RM50 depending on my routes (more highway/internal roads etc.)

To answer, perhaps more TLC for your ride?
Check your spark plugs and air filter.
Flushing may not be advised depending on the EOs you've been using and your OCIs but you could invest in a better EO.
Fuel Injection cleaner is a safe bet and definite yes but manage your expectations in terms of how much it can solve.