Hugh,
I thought that the readership of Survivalblog would like to know that I am currently burning diesel fuel that was bought in 2005. The fuel was stored in 55-gallon drums located in a cool, dark place and treated with FPPF super fuel stabilizer. I also intentionally bought my fuel in the winter months. The fuel is being burned in Cummins 12-valve engines. The fuel is low sulfur, not ultra low sulfur, so only time will tell if the same results can be expected from the new fuel that was introduced in 2007. – sj