I bought 1.3 Prosmetic in Feb 2019 , May daily drive to our farm (120-130km) includes at-least 110 Km highway drive & ~20Km city drive. Its meter meter showing 14.2KM avg. collectively after i hav driven it around 15K Km.... We have Altis 1.6 AT also which shows ~11Km on same routes. Before City, I owned WagonR Stingray EcoIdle for 2 years which used to show 18~19.5Km on same route..
So from my brief experience, i think Honda City 1.3AT is a bit fuel efficient car but its power is faaaar less than GLI or Altis....