Dear Biodiesel Users, Temperatures are expected to go down to 32 degrees tonight in Berkeley and colder in other areas. The gel point of our biodiesel is 32F in Berkeley and 27F at our San Anselmo station. Please check the weather where your car will be parked tonight. If temperatures will be within a couple degrees of the gel point, we recommend adding 20% petroleum diesel to prevent gelling. You can read more about using biodiesel in cold weather here. http://www.biofueloasis.com/faq#cautions Thanks for using biodiesel, and stay warm and drive safe! Warmly, The Biodevas