3 km/L !!!
How are you managing that.
For steering, first check the sterring fluid level while turning the sterring right and left, just fill it up if it is low
If there is noise coming from steering pump or there is any leak then it will need replacement which will cost around 20k-25k.
Catalytic will cost 15k-25k, but check errors on obd scanner, if only o2 sensor errors are coming then no need to install new cat, just replace the sensor and everything will be ok
I have installed Cruise control and padel shifters recently and avarage increase when using these
I now get 16-18 km/L on Motorways and 10-12 Km/L on city (both with AC), but i have installed new o2 sensor and my cat's honeycomb is also broken