Civic weakness - Lower arm bushes & absorber prone to fail (Confirm fail after few years of usage due to stupid bush design in it)

fuel consumption high? Check your tires air pressure, air filter, spark plugs condition and also what engine oil you use during your last change.

check for carbon build up on intake valves too

Full disclosure mine is a model 2021 civic fc 1.5 tcp (last batch).

My fuel consumption lowest is 9.7km/l and 10km/l (highest). Currently, is 9.7km/l.

Driven waja, pesona, polo, passat, c200, glc 200, can safely say civic fc is sluggish and not very responsive. Then again, once its driving smoothly on highway, its okay.

For short distance, where you expect a lot of stops, traffic or bends, i drive between 1-1.5k rpm.

For straight road or road is clear, i will let it go up to 2k rpm before i accelerate further.

The acceleration work best staggered rather than sudden acceleration, example going from 1k rpm and you step hard on peddle and it rav all the way up.

Not a car person but that's my observation.

the Civic 1.5 Turbo engine is extremely efficient if you are driving on the highway. can easily get 15 km/l
if you are stucked in traffic, every car will suffer

BTW, what is the mileage on your car? ever washed the throttle body?