Corolla Quest 1.8 Excessive Fuel Consumption

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mamoo zn

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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.
 
I tried filling at different petrol stations. Maybe a variation of 10km extra.
 
Did you buy it new and have put on 37000km in a year? That's not driving a little, that's over 3000km a month, on average driving a little is 600km a month.
I've had my Clio 5 years and it's only on 29000km it has only ever reached it's claimed fuel consumption on long open roads.
Are you doing short trips?
 
Lupus said:
Did you buy it new and have put on 37000km in a year? That's not driving a little, that's over 3000km a month, on average driving a little is 600km a month.
I've had my Clio 5 years and it's only on 29000km it has only ever reached it's claimed fuel consumption on long open roads.
Are you doing short trips?
Click to expand...
How is that relevant?
 
Lupus said:
Did you buy it new and have put on 37000km in a year? That's not driving a little, that's over 3000km a month, on average driving a little is 600km a month.
I've had my Clio 5 years and it's only on 29000km it has only ever reached it's claimed fuel consumption on long open roads.
Are you doing short trips?
Click to expand...
I bought it on 30,000KM, it is a 2020 model. Sorry I should have specified that.
 
It currently a year old and is on 37,000KMs. I hardly do mileage, mainly school trips.
Click to expand...

37K km in a year is not "I hardly do mileage". That's an average of 3 years condensed into one.

Also CVT's are notoriously uneconomical, and the worst automatic gearboxes you can buy. They are literally scum when it comes to performance and fuel economy.

Never ever buy a CVT gearbox if you want economy or performance. They are trash in every aspect.
 
Last edited:
So to clarify I do 15km trips per day (drop off - back home) (pick up - back home). Lots of stop start traffic from home to school. Even thou comparing to my i10 1.1 manual which was extremely light albeit the tank was small so a full tank last the month. Talking about 30L tank compared to the current situation. I think instead of fighting this will just down grade to a smaller car. On the note of lead footedness I have been driving for a long time. I lived in MP (worked in the steel plant), GP, CT and back to DBN. Point is I know how to control a car as well as drive conservatively. I was surprised recently when I travelled to CT, I hired a starlet 1.4 manual, it was extremely light on fuel and I was also doing stop/start CT traffic to the head office where I was consulting. This was a for a week and the needle dropped just a little, took me about 100 to top up before returning to woodford.
 
So i have a Auris 1.3 Manual which does 7.1L/100km because it does 99% local driving and no highway since lockdown as even now i WFH and do school runs.
Before lockdown it used to do 5.7-5.9L/100km easily as i drove 97% highway.
With regards to Corolla Quest Plus 1.8 CVT doing my kind of driving, i would accept 9-10L/100km as combined it should average 7.5-8.5L/100km. So my thoughts are that something is not happy with that car either injectors, temp sensor and to fix it. It would need either a Toyota dealer that is interested to fix the car or an RMI workshop to do thorough diagnostic.
 
unobeat said:
So i have a Auris 1.3 Manual which does 7.1L/100km because it does 99% local driving and no highway since lockdown as even now i WFH and do school runs.
Before lockdown it used to do 5.7-5.9L/100km easily as i drove 97% highway.
With regards to Corolla Quest Plus 1.8 CVT doing my kind of driving, i would accept 9-10L/100km as combined it should average 7.5-8.5L/100km. So my thoughts are that something is not happy with that car either injectors, temp sensor and to fix it. It would need either a Toyota dealer that is interested to fix the car or an RMI workshop to do thorough diagnostic.
Click to expand...
Toyota says they can only intervene if the diagnostics says there is an issues or if there is a visible issue. I would have also accepted between 9 - 10L/100km but this is becoming ridiculous. Thanks for the info.
 
There’s definitely something wrong, with moderate driving it should almost never go past 10L\100km.
Could be a blocked Cat or EGR or I‘d say more likely a vacuum hose because that can cause the engine management to run very rich to compensate and annihilat the fuel economy but otherwise still run fairly well. You can even check yourself, use a bright torch and look all over the engine bay for a loose rubber pipe(around OD 10mm), also look for holes in the vacuum pipe, which is harder to detect but start the engine and listen for a high pitched whistling sound which is what typically happens when there’s a hole.

Ideally to find vacuum leaks you need to take it to a mechanic with a smoke machine and they plug it into the vacuum system and with a light any leaks are instantly detectable.
 
genetic said:
37K km in a year is not "I hardly do mileage". That's an average of 3 years condensed into one.

Also CVT's are notoriously uneconomical, and the worst automatic gearboxes you can buy. They are literally scum when it comes to performance and fuel economy.

Never ever buy a CVT gearbox if you want economy or performance. They are trash in every aspect.
Click to expand...
It’s 2023 relax, CVT’s are reliable and despite your bs assertions probably the most fuel economical gearboxes available if driven correctly. And likewise performance, so much so they were banned from F1 cars. Their only drawback is some were not the most reliable in the early days or if owners didn’t regularly change the cvt oil. Granted they do feel a bit weird at first but once you get used to them they are awesome.
 
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