Compare parts prices as well. Fuel economy alone shouldn't be your exchange decision.
You should consider total ownership cost.
Compare OEM prices of parts which are routinely changed like
Oil filter
Air filter
Fuel filter
Spark plugs
Coolant (Toyota vs Changan OE coolants)
Transmission fluid (Toyota CVT vs Chanagan DCT fluids)
Also remember small engines are fuel efficient in city only. On motorway, bigger engines have better fuel economy.