A long time ago I used hot water bottles to keep the window clear for the time before the engine warmed up:
Then I went with the funbags last year:
This year I'm back to bottles, the new car has a perfect space for 33cl bottles. And for some strange reason Hyundai has decided that you shouldn't be able to defog the windshield without running the engine.
I added collars to them to keep them in place:
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)