The trouble is that people (apparently unlike central bankers) simply must buy food and energy; hence the "core inflation" concept makes no sense in the real life. Interestingly, if we measure inflation by the money supply growth, it looks as follows. Since September 2012, the MZM (Money Zero Maturity) money supply has increased by 11.6%. This is much better in line with the Big Mac index, which gained 13.6% during the same time.
This is how the real inflation looks like—the US money supply: