So there is more to this story than meets the casual eye. A lot of the shortages are spot shortages and is mostly caused by energy speculators. The US refineries are actually producing more diesel than is being consumed but it is being shipped to Europe (mostly) where the price is higher. Also the pipeline system is chock full of diesel now being piped to where it needs to go but what is in the pipelines only travels at 5-6 miles per hour and it will take a while to hit regional storage and distribution centers - FL is dependent on tankers because the pipeline system doesn't extend into FL...Check out the Youtube channel "What's up with Shipping" for a pretty good briefing on the whole situation.
I would post the link but am a newbie poster and don't have enough posts to post...or something like that!