This is what Mr. Trump says about inflation. Here is the data:
Figure 1: CPI for foods consumed at home (blue), chained (beige), both in logs, 2021M01=0. Seasonally adjusted chained CPI by author using X-13. The NBER has defined the peak to trough dates of the recession in gray. Source: BLS and author’s calculations.
The chart above indicates that the real number (admittedly, from government statistics, rather than Trumpian anecdotes) is much less than quadrupling.