Falling US petrol prices are boosting hopes that the worst wave of inflation in decades is fading, just as Joe Biden begins a campaign to convince sceptical voters that they are better off with a Democrat in the White House.
The average cost of a gallon of regular gasoline could fall below $3 in the coming days, well below the record highs above $5/g struck in the summer of 2022 — a time when soaring costs for groceries and rent were also…