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Old 08-01-2008, 05:50 PM   #7 (permalink)
johnmyster
EcoModding Lurker
 
Join Date: Aug 2008
Location: Virginia
Posts: 87

Brown Bus - '98 GMC Sonoma X-Cab SLS
90 day: 31.37 mpg (US)
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Not to rain on a parade, but...

The mileage gains attributed to dumped exhaust, loud mufflers, and straight pipes, could very well be due to another factor. The exhaust got louder, so you began to drive without your foot on the throttle as much. Mileage gain magic.
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