Mine 2012/16, 4.5 grade, 52000 driven is giving me 12 to 13 with ac and 15 to 16 without ac, varies upon the traffic conditions. petrol from PSO always gives a better fuel average.
Engine oil should be 5W 40 or even 10W 40 is fine.
cvt fluid should be changed after 40 to 50 k. it should be replaced completely with
filter cleaning.
MAF, MAP, H2o sensors & Cat. Coverter should be checked if poor fuel economy.
throttle body should be cleaned and air filter should be checked and changed regularly.