Boy you had me worried it was down in the high teens last night. Last week I filled my truck and added about 10gal of bio (B-100) to top off. The last two mornings it had been in the low twentys didn't plug in and no problems started right up and ran normal. But after hearing that story, I went out this morning and drained my fuel filter. It was a little cloudy but not real bad, I left my sample out on the porch for the day and it's currently 19* and no real change. I'll check it in the morning let you know if theres any change.