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Old 04-08-2011, 03:22 PM   #54 (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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Underdrive pullies will help a little, but not a whole lot. The problem is, they slow down the water pump and alternator, which when keeping the rpms down for fuel economy can present problems, depending on low rpm alternator output, etc.
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Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
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