By Dan Weil In March, gasoline prices rocketed 18.3% and accounted for more than half the overall monthly gain in consumer prices. Some economists and investors got excited by the fact that core consumer prices, which exclude food and energy, ticked up only 0.3% in March, compared with 0.5% in February. But whether inflation has peaked is unclear, and even if it has, it almost certainly won’t drop anywhere near the Federal Reserve’s annualized target of 2% anytime soon. Consumer prices overall rose 1.2% in March from February and soared 8.5% in the 12 months through March, a 40-year high. Food…