Click here to see the SAS code.
Click here to see the example.

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Found data here...
http://www.eia.gov/totalenergy/data/monthly/index.cfm#prices

Saved csv files:

 9.1 Crude Oil Price Summary
 MER_T09_01.csv

 9.4 Motor Gasoline Retail Prices, U.S. City Average
 MER_T09_04.csv

Used Proc import to import into SAS.
Used Proc Gplot, with interpol=rl (regression line) to plot the data.

(Note that the $ values are in "current dollars", not constant/adjusted dollars.)

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