bhai if you need feul save, then never go for local cars, buy japanse car and you will get double millage,
i had 2016 1.5 auto city, it never went above 11.8 whatever u do....
and also note that petrol pumps pe petrol chori krte hn, pura petrol nahi dalte, aur quality ki wja se you can not determine pure milleage
i get 30+ in aqua local, on long drive i notice a lot of difference in avg due to refilling of feul from diff places...