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.

4 Answers

23,585

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

1 people found this 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.

Be sure to use TOYOTA plugs or the EXACT same plug that Toyota used.. Using Generic Autolite/AC Delco/Champion/Motorcraft or other generic brand plug WILL get you almost exactly 3 MPG LESS gas mileage than the OEM NGK/ND brand spark plug. Many shops use the cheaper shit, as most customers are not willing to pay the difference... Typically NGK/ND plugs are $8 to 15.00 each. Generic ones are $2 to $4.00 each.

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