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I've run engines at idle to warm them up when working on them, both normally and with the rad cap off (purging air from system). Having the cap off doesn't seem to warm them up any faster. Changing the boiling point has no effect on warmup time. Plus, if you do boil the coolant, you have BIG issues.
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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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