A key inflation gauge accelerated in April to the highest level in three years, the latest sign that spiking gas prices and higher food costs are squeezing Americans’ finances. Inflation jumped to 3.8 per cent in April compared with a year ago, the Commerce Department said on Thursday, up from 3.5 per cent in March and the highest since May 2023. On a monthly basis, prices rose 0.4 per cent, down from the 0.7 per cent jump in March.