Pretty Insane stuff being said here.
2002-2008 corolla gives me 10 in city and 12 on motorway with Ac.
2008+ is vvti version hence gives more got 13 in city with ac no idea abt long.
Secondly its always been a trend to bad mouth newer models.
There are 3 problems in 2008+ xli/corolla
1)On CNG its not good as old model
2)A bit underpowered then old one, it only matters when you intend to do drag races lol.
3) they complain abt less ac cooling, to me thats a myth or due to not cleaning/replacing ac filter.
If you intend to drive on Petrol 2008+ Xli(not cnged) is the one IHMO.