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Cycling the water pump on and off is a BAD idea. The off cycles would have to be very short, and only at minimal to no throttle. Otherwise, you'd get hot spots around the cylinders, when the rest of the block is cold, and that could make for a warped or cracked block or cylinder heads.
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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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