I got my pan heater installed yesterday. It seems to get pretty hot, so hopefully it helps. It actually fit pretty good without needing any filler. There are some compound curves in the pan, but there was a spot that was just wavy and it followed the waves just fine. Very economical compared to any other heater I looked at. It was only $31.50 including shipping to Canada from Warehouse Auto Parts. I'll be testing it soon.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km