A Primer on Gasoline Prices

With the cost of oil above $135.per barrel and gasoline creeping close to $4.00 a gallon, have you ever wondered what the breakdowns are that contributes to that $4 per gallon retail cost at the pump?
A friend of mine turned me onto a brochure from the Energy Information Administration entitled
A Primer on Gasoline Prices.
It is an informative and easy to understand explanation of the factors that contribute to the cost of a gallon of gas.