Many states tax Diesel at a higher rate than Gasoline:
http://www.iowa.gov/tax/taxlaw/USmapGasSalesCig.pdfhttp://www.washingtondcgasprices.com/tax_info.aspxI ran across a recent article that said most refineries had increased their ability to produced Gasoline, but had kept their ability to produce Diesel/Kerosene/Jet Fuel/Home Heating oil the same. Here are some other article talking about increasing Diesel production over the last month or so:
http://www.mysanantonio.com/business/stories/MYSA051408_1D_hendricks051408.2d6fce3.htmlhttp://www.marketwatch.com/news/story/diesel-prices-full-throttle-push/story.aspx?guid=%7BA9A6465F-F30F-4466-91C7-ABFD1FCB57DE%7D&print=true&dist=printTopArticles on light and medium crudes and why this is affecting Diesel fuel production right now:
http://memrieconomicblog.org/bin/content.cgi?article=185Now the first product produced from oil is what we Americans call "Kerosene" (Called Paraffin in the UK). This was the main use of oil till about 1900. Gasoline was a by-product. As electric lights replaced kerosene Lamps, the use of Kerosene dropped in the US, but Cars started to use Gasoline and with the widespread adoption of the Automobile, Gasoline became the main product and Kerosene a by-product.
Now, in addition to Kerosene, other by-products were and are produced when you refine a barrel of Crude oil. These are numbers 1-6. Kerosene is Generally #1 Fuel oil, Diesel is #2 (as is Home Heating Oil). Numbers 3-6 are low grade oil generally used as "Bunker Fuels" in ships, barges and sometime even "Diesel" Trains. . Technically Diesel and Home Heating Oil do have to meet different Specifications, but these are so close that the main difference between Diesel and Home Hearing oil is the tax rate. Jet Fuel is generally Kerosene, but called Jet Fuel instead of Kerosene (Again for mostly tax purposes).
As a general rule #1 and #2 are interchangeable, but #2 is preferred for Diesel use to be it, generally, have a higher "oiling" capacity then #1. #1 is generally used in Cold Weather for Diesels do to its better ability to stay liquid at temperatures below freezing.
While a Barrel of Crude oil has 42 US gallons in it, the "average" barrel of Crude produced 44 gallons of product (Some products take up more space refined then it did as Crude thus the difference). The Average barrel of oil also produces only 19 gallons of Gasoline, but this is the "Average" and can be increased or decreased depending on what is wanted at the time the oil is refined. You will NOT get 44 Gallons of Gasoline out of a barrel of Oil, but you can increase the amount to well over the average of 19 gallons if needed. The same can be done with Distillate, production can increase or decrease if needed, but no matter what you do you will get some Gasoline if you only want Distillate (And you will get some Distillate, if all you want is gasoline).
What seems to be happening is the Oil Companies increased Gasoline production capacity, but ignored Distillate Capacity (It went up, but as a by-product of the increased Gasoline Production then any plan to increase Distillate production). Various reasons have been suggested, that it was to meet the US Gasoline Demand, it as to address third world gasoline demand, it was a side product of the rapid decline in the production of "Light" crude and its replacement with "Medium" and even "Heavy" Crude oil (Sweet, Medium and Sour Reflects the amount of Sulfur in the oil, Light, Medium and Heavy reflect the density of the oil, the Lighter the better).
Please note I am using "Distillate" to mean all the Distillate Fuels, #1- #6, i.e Kerosene/Jet Fuel, Diesel #2/Home Heating oil and the bunker fuels (#3-6).
Sweet Crude Oil:
http://en.wikipedia.org/wiki/Sweet_crude_oilSour Crude Oil:
http://en.wikipedia.org/wiki/Sour_crude_oilMore on oil:
http://en.wikipedia.org/wiki/PetroleumNow, it looks like the Oil Companies expected a shortage of gasoline, so increased their ability to produce gasoline, AND expected any increase in gasoline production would also increase Distillate production. Europe and Asia wants more Diesel. The North American Home Hearing season came late (Did not really get Cold till after Christmas) but was long and cold, which used up a lot of #2 oil, which come spring would have been sold as Diesel not home hearing oil.
One of the factors driving this is that today 40% of all cars in Europe use Diesel. 90% of US cars use Gasoline. Thus my comments about Europe and Asia wanting Diesel not Gasoline.
I can see this being a one two punch on the oil companies, the first is their increased Gasoline production do to the decline in their access to "Light" Crude, but then was hit by an increase in demand for Diesel in Europe do to the fact Diesel Vehicles get better fuel economies then Gasoline Vehicles. With the Home heating Season ending late this year, the oil companies ended up with a shortage of Diesel, while they have plenty of Gasoline (Through the price of either is being driven upward by Peak Oil).
Now this may lead to a drop in price by the end of Summer. Speculators could be buying Diesel futures and driving up the price. As the oil companies switch their plants to make more Diesel, we may end up with a surplus of Diesel by Mid-Summer (while Gasoline stays about the same). This will lead to a drop in the price of Diesel by the middle of Summer. This may extend to Gasoline, but the drop in price will be temporary for the fundamentals are sound, peak oil is hitting us NOW. I can see the price of Diesel dropping to about the price of Gasoline. I can see a slight drop in Gasoline, but after Diesel price stabilize, I see both then going back up, but in a more unison fashion then they have been.
Thus the recent talk of Speculators gaming the market, may be that speculators are seeing the problem being Diesel and buying Diesel fuel today expecting it to go up (and it has). AS Krugman said last week, there is NOT reports of excessive storage of any type of oil. If that is the case we do have a real shortage and the Speculators are just the first to see it and exploiting one part of it. Thus my comment that I see the price of Diesel dropping, maybe taking Gasoline with it for a few weeks (or months) but the fundamentals are sound, and the bottom will be found quickly and the price rise will re-start. Rascally come this fall when US home hearing fuel comes back into demand in anticipation of Winter.
More on "Fuel Oil":
http://en.wikipedia.org/wiki/Fuel_oilhttp://science.howstuffworks.com/oil-refining2.htm