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You could also try a partial radiator block to help it warm up faster, and maintain operating (and good heating) temps.
I don't know if this is true of all cars, but on a long downhill my Insight cools to about 140 F, as the fuel to the injectors is cut. When it drops below 140, it starts burning extra fuel to keep the temp up. I seem to see much the same behavior in the pickup, but since it's pre-OBDI, I only have a rough idea of the actual engine temp.
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