No its definitely impossible and a tax refund can only get I series paper bonds unless its changed yet again. Also the rigged CPI-U is lower than the real worl

No its definitely impossible and a tax refund can only get I series paper bonds unless its changed yet again. Also the rigged CPI-U is lower than the real world inflation rate, so you're basically buying a piece of paper for $100 today that can be sold for $90 years later plus you get to pay federal income tax on the inflation protection part (So $100 stuck in a mattress would be worth $80 in a couple years so you get to pay $10 worth of income tax).