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The coldest around here runs 20 to 25 below F. I have let the car run all day in the parking lot at work since there was no plug in available and once when out of town for a funeral I let it run all night at the motel. Running all day or night uses maybe a couple of gallons of fuel at most and when you get ready to go the car is all nice and warm. I keep an extra key around in winter for these occasions so I can let it run and lock it up.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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