I have purchased, but not yet installed, my block heater. The installation looks straight forward, and I will do it at my 50k oil change, when I would normally change my antifreeze.

I intend to use it on nights when the temp would be below 20F. I believe that the wattage was 25w, which means that for a 12 hour burn, I would use .3kw which would cost me about $.05. If my mileage is 2 percent better, or about 1 mpg, that translates to 12 miles per tank or .24 gallon or $.60 vs $.35 for the electricity.

I am hoping, however, that the mileage is much better than 2 percent, as my winter mileage slumps more than 20 percent from summer highs.

-Charlie...