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Old 10-08-2010, 05:46 PM   #223 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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It adds load, which causes the engine to throttle up a little to compensate, increasing the idle fuel use.
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Typical driving: Back in Rochester for school, driving is 60 - 70% city
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