On a modern engine, 210* is a pretty normal running temp. As long as it's not over 215 - 220 for sustained periods of time, I wouldn't worry.
With a 50/50 mix of water and coolant, plus the pressure in the system, the boiling point is raised considerably.
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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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