Gas mileage drop off

#1
I have a 2017 Corolla ECO with 206,000 miles on it.
Looking for info on mpg dropping off from average of 35 to 30
pull throttle body cleaned with CRC, not as dirty as expected, replaced gasket
& assured proper seating. New air filter as well.
Spark plugs probably have 80,000 on them next thing to look at.
One week of driving NO improvement. Any ideas? What about fuel filter??
Anybody?

Thanks Jarvis
 
#2
I have a 2017 Corolla ECO with 206,000 miles on it.
Looking for info on mpg dropping off from average of 35 to 30
pull throttle body cleaned with CRC, not as dirty as expected, replaced gasket
& assured proper seating. New air filter as well.
Spark plugs probably have 80,000 on them next thing to look at.
One week of driving NO improvement. Any ideas? What about fuel filter??
Anybody?

Thanks Jarvis
Mass Airflow Sensor may need replaced. O2 sensor is another that influences mpg.
Be sure to use original Nippon/Denso parts.
 
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