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The new 2013 Dodge Ram features an active transmission warm-up system where the transmission oil is heated to a controlled temperature by the engine coolant. Active grill shutters and electrically heated engine coolant thermostats are also under consideration for faster warm-up with the grill shutters being introduced in some 2013 models. The fuel economy benefits are small on the FTP test where the cold start occurs at 75 F (about 0.5% benefit each for the transmission and engine warm-up features)
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That would indicate that block warmer should be used earlier in the fall and later in to spring. I wouldn't have thought there would be that much of a benefit (0.5%) at 75 F. The cost of the electricity might offset any cost savings.