Toyota Corolla Poor Fuel Economy – What Could Be the Cause

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Toyota Corolla Poor Fuel Economy – What Could Be the Cause

Hi all,

I’ve been getting terrible fuel economy on my Toyota Corolla lately. It’s averaging around 20-22 MPG, which is much lower than the usual 28-30 I’ve gotten in the past. I’ve had the car for a while, and I do mostly city driving, but this decrease is concerning.

Could it be something related to the engine, like the air filter o r spark plugs? o r maybe an issue with the fuel injectors?

Would love to hear if anyone else has experienced this and what you did to fix it.

Thanks!

Qalb E Momin asked on 29 Jan 2025 17:13:08 pm

1 Answer

25 views |

Car Mechanic Expert - on 29 Jan 2025 17:20:51 pm

A decrease in fuel economy like the one youre experiencing can be caused by a few common issues. A clogged air filter could reduce airflow to the engine, making it work harder and consume more fuel. Worn o r dirty spark plugs can cause inefficient combustion, leading to lower fuel efficiency. Additionally, problems with fuel injectors, such as clogs, can result in improper fuel delivery, impacting fuel economy.

It’s also a good idea to check the tire pressure, as low tire pressure can increase rolling resistance and reduce MPG. If you havent done so recently, try changing the air filter and inspecting the spark plugs. A fuel injector cleaning might also help if you suspect they’re clogged.

It’s worth considering if there have been any changes in your driving habits o r if the car has developed any other issues, like brakes that are dragging o r problems with the fuel system. If the problem persists, getting the car checked for any fault codes using an OBD-II scan tool could reveal if there’s an underlying issue with the engine o r sensors.