In India FE is like a mine bigger than yours contest, many people like to quote numbers which are much higher than actuals to Boast/ feel good.
In actually checking FE, I have noted that in short trips inner city with 4 people compared with driving cars without A/C single person on Highways far away from city, the same car will give 50-60% FE between the most favorable commutes and least favorable type of usage Tank to Tank basis.
I don't some people claiming 19 KMPl in Short distance inner city commutes online is accurate or based on actuals.
The other trick which some posters do on long trips is drive well out of the city when the engine is fully warmed up Switch the A/C off, reset the FE trip meter, drive for say 40-50 kms with the car coasting at around 50-55 kmph. Take a mobile pic of the MID and claim that is 100% A/C 4 adults plus luggage yadda yadda- my car gives great mileage.
Just to needle these folks I drove in a similar manner for 50-60 kmph near Mettur. Can I get this Milage through normal driving- absolutely not.