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Old 09-13-2008, 06:41 AM   #41 (permalink)
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There is a lot of data on retiming the ignition and cam for the Geo Metro if you have a browse, don't know about the others.


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Old 03-28-2009, 03:46 PM   #42 (permalink)
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christine - '02 LeSabre Custom
90 day: 23.45 mpg (US)

fronty - '04 Frontier XE
90 day: 18.97 mpg (US)
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actually, some engines work more efficiently with a bit of backpressure in the exhaust , but usually anything less than stock is good.
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