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Old 07-01-2010, 12:48 PM   #5 (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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OEM thermostat is a 195*. The gauge in the ZJ is a real gauge (not a buffered-reading dummy gauge), and typically reasonably accurate.

If it sits right on the line below straight up (or just above it), it probably has a 180* t-stat in it.
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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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