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I plug mine in at tempuratures below 10C [50F] and have it on a timer for 90 minutes only, on work days, on other days, I just plug it in about an hour before I leave. So far the things I've noticed are that the cold engine lite goes off 30 - 60 seconds sooner, at -20C, the scan guage WT first drops from about 35C for about 30 seconds then rises to 55C in about 1 minute on the highway. I have not tried to quantify how much fuel I save.
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