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Old 11-12-2009, 08:39 AM   #2 (permalink)
vtec-e
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Join Date: May 2008
Location: Ireland
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De Yaris - '04 toyota yaris T2
90 day: 69.55 mpg (US)
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Build up a good average, perhaps using the fuel log here as a reference. Then do the modification. If there is an improvement then it will show up in the fuel log.

ollie
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