The miles per gallon on my 2009 Toyota has suddenly decreased by about 3 mpg. Anyone know why?

Asked by Apr 29, 2013 at 12:15 PM about the 2009 Toyota Yaris S

Question type: Maintenance & Repair

I've been getting 40 mpg on my 2009 Yaris since I bought it new.  In the past few months, it has started getting 37 mpg consistently.  I have about 85,000 miles on it and asked them to put in new spark plugs with my last oil change.  I change the oil regularly.  Any suggestions would be appreciated.

3 Answers

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oil different type or weight? synthetic is said to increase MPG? some imports are fussy about brand of plugs.

1 out of 1 people think this is helpful.

I did use a different oil on my last change....went to a "high mileage" type. I can easily try going back to my old standby and maybe I'll ask them to change the wires along with the plugs next time? Thanks!

During the winter months , gas stations use oxygenated fuel which will reduce your gas mileage. Colder winter temps and worse road conditions will do the same.

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