Hah, perish the thought! I'm sure I'll get my dose of -40 sooner or later.
Tell you what, I had been told that a block heater helps with warmup, which in turn helps with gas, but I didn't realize just how big of a savings that would translate into. Before getting it installed, I was using about half a tank a week when it got to be really cold, less so when the temperatures have been higher. In the week since the installation, I've used just a little over a quarter tank on the same exact drive schedule. That's close to 50% less gas consumption! I was reading in an article that your engine can use almost 3 times the normal amount of gas in extreme cold if it's not up to operating temperature, but it's incredible to actually witness it.