Altis Grandee 2018 Facelift - Poor Fuel Avg 7-9km/ltr

[hamzatariq001]

AOA Everyone!

I'm on the verge of getting rid of my corolla. I don't know much about cars, most of the information is gathered thru forums or interaction with local shop mechanics.

Whenever I ask someone about their mileage, I get to hear numbers between 12-15km/ltr, and I am hardly getting 7-9km/ltr.

No matter what! Lightfoot, heavy foot, less traffic, more traffic.

I am unable to pin down the problem.

Here's what I have tried so far:

• Changed Spark Plugs
• Catalytic Converter Cleaning
• Throttle Body Cleaning
• All Fluids, Filters changed, and regularly maintained.
• Computer Scanner - done by a local mechanic, he connected the tab and checked for errors.

Same route, same routine. I get around 11-12km from Civic X, and Grandee is bleeding me.

[pwuser165176643628]

@haseeb.basharat

[capsat]

which engine oil grade you are using?
which city you are from ?

[engnr.mubashir]

Use 5w 50 toyota taglon oil as recommended by Toyota IMC then check the average. My cousin having grande X and using it since day 1 always get the oil change from dealership and they pour 5w 50 oil. I have personally drove it average in karachi city is 11.5 to 12.5km/l and 16 to 17.5km/l on highway with cruise control. And I think owner manual of grande also suggest said oil grade.

[haseeb.basharat]

which engine oil grade you are using? which city you are from ?

I get 9km/l when I keep it flooring all the time, normal driving fuel average is 12km/l and on long journeys it's 15-17km/l at speeds of 110-130km/h.
@op switch to 5w50 oil.
.
Imc recommends 5w50, and that recommendation came with the manual of latest variant Grande X. 0w20 and 5w30 reduces fuel economy badly. I used it @autophile used it and faced same issue.

[haseeb.basharat]

You're right. Many here suggest 5w30 for pkdm grande, even I got confused and started using that.
Fuel economy dropped drastically.
Using 5w50 in a 175k kms driven car without any issues.

[haseeb.basharat]

Check readings of mass air flow sensor.
Which spark plugs you're using? Any change when you change spark plugs before/after?
Which oil grade you're using?
What's the status of wheel alignment?
Drive at 80km/h, turn the cruise on, share rpm here. It must be 1900.

[pwuser165176643628]

Why does thinner grade reduce fuel average?

[pwuser165176643628]

And what is your experience with gli fuel average

[engnr.mubashir]

Only Toyota can answer this.

[pwuser165176643628]

Which oil do you use for gli?

[pwuser165176643628]

I'm currently using total 10w-40 and thinking about switching to taglon xe on recommendations of @haseeb.basharat

[pwuser165176643628]

Local mechanics say that zic is best but I haven't heard anyone in this forums vouch for it

[engnr.mubashir]

I’m using ZIC and average is not effected compare to fully synthetic valvoline oil 5w 30.
I’m using ZIC because of cost as expenses are sky high and very hard to manage a synthetic blended oil so using 10w 30 x7.

[haseeb.basharat]

Why does thinner grade reduce fuel average?

You purchased IMC made car, so would you choose IMC recommendation of oil or Toyota japan/usa?
Don't know much, maybe they assembled engines as well in Pakistan.

[hamzatariq001]

I'm from Lahore.

Using 5w 50, used Kixx, used Toyota oil as well. Same average.

[hamzatariq001]

I get between 7 to 9km/li in city, with light foot, occasionally flooring it for a sec or two, usually for overtaking.

On long route, I got around 12-13 with 4 persons, cruise at 110-130.

Already using 5w50.

The RPM jumps 1-2.5 and then drops down, I have pull up feet to get the rpm down, and then again adjust my foot on accelerator.

I don't know where I am wrong. Just came back from a small drive, it was showing 8 avg, and now around 7.1.

[haseeb.basharat]

The RPM jumps 1-2.5 and then drops down, I have pull up feet to get the rpm down, and then again adjust my foot on accelerator.

I don't know where I am wrong. Just came back from a small drive, it was showing 8 avg, and now around 7.1.

Holy. My car never gave this bad fuel economy even after idling with ac on for an hour or so.
Please visit @syncview and see what he can do for you.

Btw how you're calculating the fuel average?
How much your car lasts on full fuel tank?
Mine does 600kms in city if I use reserve too, 520-530 without reserve, and
800kms on motorway before the reserve light shows up.

[hanzalahch25]

Salam Bhai I'm using 5w-30 since day 1. So I'm thinking of switching to 5w-50. Does it require some sort of engine switching or just I have to drain 5w-30 and pour 5w-50?

[ifadey]

Using thicker grade improves fuel economy contradicts the research done so far in the field of automotive. I have read multiple research papers on this and never found results improving fuel economy with thicker grades. It doesn't make sense at all.

Usually 50 grade is used on race tracks vehicles, not in everyday cars. Even Porsche's usually use 0W-40 these days.

I don't believe these results until someone proves it with a test in a controlled manner.