Fuel average gone worst after ECU reset

[markusmanp]

Hey Pakwheelers,

I have a Toyota Corolla 1.3 2013 model. It was giving an average of 14KM/L local however while checking the battery fluid level, I mistakenly reset the ECU, after that I have run it over 300KM local but the mileage does't seem to go above 8.5KM/L. I did notice that it keeps getting better, for example right after the reset it started at 6KM/L and is gradually increasing but how long before it goes back to normal? And what's the reason behind this?

I had heard that resetting the ECU could actually increase the fuel efficiency but things seem to be going in the opposite direction with this car.

Many thanks!

[Xulfiqar]

Its a learned value - you have to drive it atleast 5000 kms for it to give a better average reading. Right now your average is being measured with a very low no. of kms to reference against.

[unknown_one]

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[Xulfiqar]

I dont think that toyota even advertised 5 l/100 kms for a corolla

[markusmanp]

Haha! I haven't lost my mind as I mentioned it was just an accident on my part while checking the battery fluid.

[markusmanp]

That makes sense! Thanks bro! I know in this 300km trip in Rawalpindi city, the average speed was just 13kmph which is awful. I plan to travel long distance soon. I hope that helps.

Thanks again!

[Xulfiqar]

how does one disconnect the battery when checking the electrolyte level

[markusmanp]

I did it somehow! ️

[dani_kk]

You're looking at the economy from cluster? Right?that's obviously not going to show up correct reading since you've done reset.. So don't worry..
Calculate the manual economy by fuel used & distance covered method. That's going to be perfect i beleive.

[rajaatta]

No problem for the on board eCo meter if you reset and drive it in urban conditions it would never cross 10km/L

Straight thumb rule I follow for optimization is I take the vehicle on semi long route or long routes and maintain a e onomy speed of 80 -90 km/h and resets the eCo meter and keep driving it steady after 30-50 kms I get beat results. Remember long distances can acheive a good on board eCo mileage. So always reset it on long routes

[markusmanp]

That totally makes sense. Thanks! Another quick question, how much fuel is there in the tank when the reserve warning light comes on? Also, I'm guessing the total tank capacity is 55L right?

Thanks again guys. You're so helpful.

[rajaatta]

Max 6 liters

[pwuser155091178738]

Wait atleast it gets to 5000km, most probably after 3k it will be on its normal position, go slow on pedal for sometime.

[Xulfiqar]

dont let it drop till light comes on, the fuel pump requires to be dipped in fuel to cool down. Refill at 1/4 tank

[dani_kk]

Tank is 50L & reserve is nearly 9-10 litres...