Some variance, and up to 20* or so above t-stat temp is normal. However, 240* is not. If the car has an electric fan, make sure it's working properly, and not getting weak. If it's a mechanical fan, check or replace the fan clutch.
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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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