:Also looking at the chart, the "Average" needs to be removed.  The CPI is an index and an index value is reported monthly.  This value is an index not really an "average."  I assume that the index value is being reported and that nothing is actually being averaged here. 

 :As for the other issues... the chart is not supposed to be comparing the percentage change and index value, these are just the two most common ways of looking at the CPI. A chart of CPI and median income percent changes wouldn't show much, a chart of CPI-adjusted median income would represent the same information but be more easily understood. Which exchange rate would be included in the chart? I don't think a chart like that would be very useful.  It sounds like you want to show how the CPI changed after the dollar went to full fiat. If anything, I think we should include lines showing the end of the gold standard, Bretton Woods, and maybe events like the 73 oil crisis.