According to a petroleum analyst:
"A substantial gap has developed between the prices for heating oil and natural gas. Why has the price of distillates increased?
The answer to this question has to first start with what has been happening in the downstream market in the U. S. and Europe. Since 2002, world demand for the middle of the barrel has increased twice as fast as demand for gasoline.
This has led to what we believe is a somewhat unbalanced product market (
and probably not sustainable over the very long-term) where the middle of the barrel (distillates) are priced higher than gasoline. From a pure production cost outlook,
distillate should be cheaper than gasoline. We are not getting the historic relationship in pricing between the middle of the barrel and gasoline because the Europeans and other world refining centers are running full tilt to meet distillate demand, which is also yielding substantial volumes of gasoline components in excess of local demand. These gasoline components are then sold into the U. S. market.
Note that we at EPRINC don't view distillate as selling at a premium to gasoline, but gasoline being discounted to distillate. Of course, both statements are accurate, but how you look at this problem is important for understanding how the market is likely to shift over time. Over time we would expect the Europeans to reconfigure their refineries to reduce gasoline, and increase distillate output, but this will require substantial capital outlays. This is one reason why the price spread between natural gas and heating oil has opened up so much over the last few years. "
http://www.eprinc.org/pdf/O&E_Jan08_EPRINC_Q&A.pdf (page 2)
Unfortunatly that is no longer true. ULSD requires more refining to make than gas. The old stuff took hardly any refining in comparason.
While it's true that ULSD requires more refining than the higher sulfur fuel, gasoline (reformulated gasoline - RFG) still requires much more "refining" than ULSD, based on data from UC-Davis (
http://www.its.ucdavis.edu/publications/2003/UCD-ITS-RR-03-17-MAIN.pdf ):
RFG requires 0. 170 BTU-process/BTU-RFG - ultra-low sulfur diesel (USLD) with 5 ppm S by weight requires 40% more energy to produce than does conventional diesel (CD = 0. 058 BTU/BTU – page 93 [110 of 444]) with 5000 ppm S by weight (page 96 [113 0f 444])
RFG = 0. 170 BTU/BTU; ULSD = CD X 1. 4 (40%) = 0. 058 X 1. 4 = 0. 0812 BTU/BTU; 0. 170/0. 0812 = 2. 09 (page 96 [113 of 444])
Per unit volume = 2. 09/1. 12 (12% more energy per unit volume than gasoline) = 1. 866 = 86. 6% MORE energy required per gallon.
Gasoline has to be more or less "manufactured", since there's very little "naturally-occurring" gasoline in a barrel of crude oil (
The Oil Drum | Refining 101: The Assay Essay ), and that's unsuitable for vehicle use because of low octane (around 70). "Naturally-occurring" middle distillate is much more abundant in a barrel of crude (20%-30%).
It is my understanding that a significant amount of the middle distillate is "cracked" to gasoline:
"…All refineries do essentially two things. First, they separate crude oil into its component fractions of propane, butane, gasoline, kerosene, diesel, various "gasoils", and heavy fuel oil or asphalt. Then, after separation, some of these fractions are processed further to convert them into other products or improve their quality. The workhorse for much of this in most refineries, particularly in the US, Europe and Japan, is the fluid catalytic cracking unit, or "cat cracker", an expensive piece of hardware using updated versions of a 60-year old technology to
turn diesel and gasoil into gasoline. "
The sudden spike in diesel fuel cost this past February is still a mystery to me since major oil refiners have been producing ULSD since October 2006, and Europe/Asia have had high demand for diesel for many years.
One last point... at least two oil refiners have announce that they plan to increase diesel fuel output relative to gasoline (although that will likely take a few years):
"…the expansion [Marathon, Garyville, LA, refinery] will also result in an increased percentage of diesel in the product mix…"
Free Preview - WSJ.com
"…Wrapped up in this strategy is Mr. Morris' investment in equipment to boost diesel production. The output for most U. S. refineries is one-third diesel, two-thirds gasoline. At Alon's California plants, the output will be the opposite…. "
The Dallas Morning News: Think diesel » Royal Dutch Shell plc .com