Germany expects another night with temperatures down to -20°C in the Alp villages. Last week we had down to -29°C in the lowlands, -31°C in the Alp villages and -38°C in the mountains itself.
We have all kind of Ethanol fuel, even many E85 petrol stations since 2005.
But Sweden is even much more fond of Ethanol and started much earlier with it.
You know where Sweden is?
It reaches up to N69°, Fairbanks/Alaska is "only" N65°. -40°C is cold for scandinavian villages, but not a sensation.
Maybe Florida is much colder than Sweden. Then of course your coasts are full of ice - like the German (and naturally Sweden) coasts now.
But I think, that a fuel which works well in Sweden, will work in the comparative warm Germany too.
It did work during the wars (Germany has no oil-wells) and I don't see any reason why it suddenly shouldn't work.
Sorry, I'm only a layperson from a 3rd world country. Our fellow countrymen don't know about engines, they only invent them.