I propose one modification to the above description:  gas prices are ultimately set by (a) the price of crude oil; (b) the cost of the refining processs; and (c) the throughput of refiners in processing crude oil to meet gasoline demand.

Item (c) is important.  There can be a decoupling between gas prices and oil if refineries cannot meet gasoline demand even if oil is available.

Item (c) is important.  There can be a decoupling between gas prices and oil if refineries cannot meet gasoline demand even if oil is available.

That is exactly correct. It would not surprise me to see oil and gasoline prices diverge, or at least change in the same direction, but by starkly different percentages. I know some people who are playing a spread between the two in the futures markets with this expectation (and have been making good money so far).

RR

The full breakdown from the article is:
  • 47%: Cost of crude
  • 23%: Federal, state, and local taxes
  • 18%: Refining costs and profits
  • 12%: Distribution and marketing, retail dealer profits
Indeed, the increase in crude prices may be obscuring more subtle things that are going on in the background.
One note, these figures are based on 2004 prices.