Humbledriver24

Hello guys im new here, i ve bought a fit ge6 2012 recently with 70k on odometer and vehicle is giving me fuel economy of 8-9kmpl in city without traffic and 13kmpl outstation is it normall for this vehicle?? , last owner gave me all tge service records but now i notice that has been using 10w 30 oil on the vehicle whole the time but the recommend in the manual is 5w 20 .so im about get this vehicle fully serviced now but have doubts about engine oil can some one tell me which oil should i use?? and will i be able to get somewhat better fuel consumption than currently having thnx