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Diesels like cold air and hot coolant. Most modern diesels use 195* thermostats, a few even use 203* (common performance mod on powerstrokes). In a diesel, the hotter engine burns fuel better, giving better power and mpg, as long as the intake charge is cool enough.
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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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