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Old 01-04-2011, 11:00 AM   #26 (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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I'm not sure how light those come. With an auto tranny, it won't make as much of a difference, however, as most of the weight is in the torque converter. Keep in mind, being a long-ish stroke I6, the 4.0 has a lot of internal rotating mass, and probably doesn't have a super-heavy flywheel anyway.
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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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