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Old 09-20-2010, 11:50 AM   #11 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
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RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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It's actually coming from both. The direct benefit may come from the gearing, but without the supercharger, they wouldn't be able to gear it like that, so they both help.

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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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