The same thing is happening in Australia. I dont know what the US does but here they use all sorts of tricks like 'food substitution' and weighting stats (for their benefit, both ways) done recently when a cyclone destroyed the banana crop and prices shot up. Food substitution is like if the price of beef roast rises the people will eat ground beef (or kangaroo) the cheaper alternative etc. No time to go into it but inflation is out of control here and the CPI does not reflect it. Although it is at the high end of the Aussie feds comfort zone
Has already been proven: http://www.shadowstats.com/cgi-bin/sgs? Maybe you are the one in need of growing up and being educated.
Joe sixpack has his own CPI and his own definition of inflation. The govt CPI is psychological, joe sixpack is real money.