[mechman600]

So the point of a block heater to improve economy is to get the engine into closed loop quicker.

My '84 Volvo 244 knows nothing of loops, as it has a Zenith side-draft carburetor. Given that my commute is 4 miles each way, I am guessing that there could be a massive benefit to wrapping some 120V pipe heater tape around the carb and plugging it in for an hour before I leave for work, along with the old space heater I am already using to pre-heat the cabin. Especially on these 30-40 degree mornings. I would be great if I didn't have to pull the choke.