Consumption seems to have been weather related, agriculture demand was much higher last fall both for fuel and propane because of a much larger harvest than the previous drought year. Plus wet weather during harvest required more propane for crop drying, and then the colder winter has put pressure on both propane and diesel. Be interesting to see what it all looks like in April and May.
Reasonable explanation that many people accepted for 2013, but the 4-week running averages have remained universally inflated since July 2013, without harvest or weather-related fluctuations. If oil prices fall sharply in the coming months, as they usually do during the spring, then we can assume noise is influencing price. Otherwise, we have a new trend.