I'm quoting numbers from the BLS, no need to point me at the BLS.
The last two months of CPI were 0.2 and 0.4 respectively. (0.2 + 0.4) * 6 = 3.6, not 7. You accidentally put a factor of 2. (yes I know multiplying by 12 to go from month to year is an approximation, but it works well)