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02-25-2009, 06:17 PM
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#11 |
  Drives: Yaris 5 door liftback Join Date: Jan 2009
Location: Portland, OR
Posts: 648
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It took me three tanks to notice the difference but I kept on. It's been at least a year and a half now and I know the ECHO was consistently getting about 2 mpg more. I am not sure about the Yaris because I started using it right away.
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