The miles per gallon on my 2009 Toyota has suddenly decreased by about 3 mpg. Anyone know why?
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.
oil different type or weight? synthetic is said to increase MPG? some imports are fussy about brand of plugs.
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!
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