Out of all Corolla auto variants, Gli 1.3 AT have worse average. IMO Grande return best fuel economy then comes Altis 1.6 and Gli AT is at bottom of the list.
In my case so far, Altis 1.6 gives around 12 to 13.5 with A/C in city depending upon traffic conditions. My colleague had Gli 1.3 AT, max he got on M2 was 12.5 with A/C, In city it remained 9-10 km/l, Reason is obvious a 84hp engine with around 1300 kgs body weight and 4-Speed AT.