Poor miles per gallon with my 2004 Toyota Corolla automatic transmission! What can be...

Sen

New member
...the causes? Thanks.? My 2004 Toyota Corolla automatic transmission with a 120 000 mileage is giving only 23 mpg. I follow all the tips that a driver can do to save gas but it didn't work. I even asked a mechanic but he couldn't answer. Can someone please tell me what may be the causes and what can be done? Thanks a lot.
 
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