Had shared fuel economy figures for pure city driving earlier, for my Honda CITY 1.2 CVT.
Sharing below figures from a Recent M2 journey lhr-isl-lhr. 4 full size adults, AC 100%of the time, half an hour of idling at rest area and speed maintained at 125kmph (120-130).
Might be helpful for any potential buyers.
And as per my experience; Yaris, Civic and Corolla all have similar figures (14-15.5kmpl). A BrV on the other hand, with similar conditions, does 13-13.5 kmpl max)