Warm winters are great for biodiesel

So, 2 months have passed since my last confession!?
I really didn't mean to write anything else cause nobody's looked at this page. But now, Someone has actually been on this page snooping around.
As you can tell from the date, the temperatures have gone down, below freezing point.
4 or 5 days in a row, I've been starting my car in the morning at temperatures of -4,5°C (23,9°F), with nothing in my tank but 100% pure biodiesel.
Usually you can find data on the internet, that biodiesel becomes useless at temperatures below the freezing point of water, unless it's mixed with petro-diesel, or some other additive is added.
If you scroll down this page you'll find some pictures that show you what my biodiesel looked like after it came out of the freezer. That's probably why I can still start my car normally at these low temps.
Ive tried stuff to lower the gelling point of my biodiesel, but still haven't found anything worth mentioning.
The only thing that I can think of , that makes my biodiesel stay liquid at low temperatures, is the kitchen that provides my oil, gives me oil that has very little animal fats in it. The oil has such a nice color (after I let it sit for a week), that re-using it in my kitchen has really crossed my mind. Only when you compare the color with new vegetable oil, you see that it's really used oil.