I've yet to find any index that indicates that the value of the US dollar has changed this much in five years. Mostly because of the pressures put on CPI indexes to not demonstrate inflation or reduced purchasing power, as so many other things are tied to CPI indexes, such as benefits increases.
Wouldn't such non-essential products as I've listed here be a more true indication of the relative change in value for the US dollar than the CPIs that you are advocating?
Food, energy, housing, transportation, clothing, health care, etc.
Those are the things that drive inflation in my opinion. Your mileage may vary.