Corolla Quest 1.8 Excessive Fuel Consumption

So a bit of an update - I traded it in for a Starlet 1.5 Xi -manual which is a pleasure to drive. The petrol lasts a lot longer :cool: Averaging around 6.5L/100km.
 
I have a Corolla Quest Plus 1.8 CVT. Car drives well and no issues except for the fuel consumption.
It currently a year old and is on 37,000KMs. I hardly do mileage, mainly school trips.
Initially the car was on 18L/100Km then did some long distance trips to PMB to "open up the engine" as per dealer. It dropped to 14L/100KM.

It currently on 13.5L/100KM.

Before there are comments about lead foot...etc, I have a 320i F30 which is doing 8L/100KM. I had an e90 320i 2007 which did about 10L/100KM.

Toyota says there is nothing they can do about it as there are no faults.

I have done some research and there is something about the oxygen sensor being faulty. It won't show you but will cause a high mix of fuel. The car is very nippy.

What can I try besides trading in for a suzuki swift or baleno....? We Buy Cars offered me a smack in the face 195k and are selling them for 250k.
Definitely something wrong. I currently drive a Corolla 1.8 Exec Auto (2007) and get 8.0L/100km stop/start daily driving.
 
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