I read an interesting paper on block heaters yesterday.
REDUCED COLD START EMISSIONS THROUGH USE OF ELECTRIC ENGINE HEATERS
Did you know that using a block heater year round can help reduce your carbon footprint by over 500 pounds?
Did you know that by using a block heater you can reduce your overall CO and HC emissions by up to 80% on a 3.5 miles trip.
Did you know that using a block heater saves your roughly 0.07 gallon per cold start?