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I've been studying economics lately since I'm a stats freak and I find the economy really interesting, I also like to plan things financially so it's nice to spot where trends are going. Here's a chart of diesel prices over the last 5 years, adjusted for inflation. I already had the price data in my database so all I had to add was a table for the consumer price index and create a view to display the new data. The values are in 1982 dollars, to convert to current values just multiply them by 2.13 which is the CPI for March 2008.
Diesel Prices - Inflation Adjusted: