When we lived in indiana I parked in an unheated garage, even at -20F outside it was easily 30 degrees warmer inside the garage. Even in more mild weather of +20F without a block heater it took several miles before the engine hit operating temperature. With the block heater it would reach operating temp before I even got to the edge of town (1 mile tops). I think I have it in a post/thread around here somewhere.
I had the stock 600w heater on a timer, would run about 5 hours each night. For me the fuel savings were icing, the cake was full heat much more quickly.
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