Dipped well below freezing last night. Vitara fired up on WVO and 10%dino, no problem.
In fact it ticked over better than if it was warmer.
There is an automatic advance on the pump, that increases the revs. Soon as the engine warmed up a bit, it shut off, then it ticked over like a dog.
I'm starting to think it has two stages, the second stage coming in at freezing.
Might have to investigate that a bit further.