To start with the Japanese domestic models, its starts with X,G(1500cc), G-limited and Luxel. Luxel is the highest grade of the corolla series which comes with a chasis (ZZE 122) and has a 1800cc engine with unique auto tranny. G and X does good on fuel for short distance. Xli,Lx limited and Gli( 1600cc) are all export models and they come with lesser options when compared to the JDM models in the 121 series.
From my piont of view, i am using a 122(luxel) in the city with mix traffic with sensible driving i get figures of 11km per litre. Outstation get figures of 15+ km. Quite happy with the fuel figures for a 1.8 litre engine. Btw if you do not wish to drive a 1.8 litre coz of fuel concerns then a G or a G limited grade would be ideal.