5-6km/l is on the short trips,I have not been on a highway with it.I will also check out the brakes and see if they are sticky. 
  
My air condition is not working overtime,I use it once in a while. I will go ahead to replace my 02 sensor,we do have an NGK distributor in the country where i will buy one. 
  
  
My tire pressure and wheel alignment are fine i did them recently when i bought new tires.I will have a mechanic look at the Engine Temp Sensor. 
  
Let me replace the 02 sensor,Fuel Filter and check the brakes too.I will keenly observe the fuel consumption after these repacements. 
  
I appreciate all the expert advice and tips you have given me so far. 
  
Thanks, 
Micheal.