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My CPI is different than your CPI
@BlokchainB's point is the key. In a sense, these aggregate numbers are meaningless, because it's individuals who face idiosyncratically changing price levels.
My approach, to just have a general sense of what's going on, is to look at the official numbers, compare it to my own experience, read some critique of the official stats from reputable folks, and generally just not put much stock in it.
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For CPI? Do it locally, at the county level; will give you much more meaningful information (for you)