Right - diesel and heating oil are close to the same thing (as is kerosene) so when there is high demand for heating oil (it was an abnormally cold November across many areas) diesel is likely to climb. Add to that, overall energy prices (gasoline and natural gas) are also up as of late. Check out TheEnergyDesk. RBOB is wholesale gasoline. There is a delay as to when these prices *typically* rise/fall at the pump, but you should be seeing gasoline on it's way up too. It just started climbing around here this week.