(Bloomberg) -- Disruptions on the world’s major trade routes, refinery closures and resurgent demand are pushing up global fuel prices and making forecasts difficult in the run-up to a US presidential election in which inflation will be a key issue.Most Read from BloombergOne of the Most Infamous Trades on Wall Street Is Roaring BackStock Rally Stalls in Countdown to Inflation Data: Markets WrapChina Has Never Canceled This Many Shipments of US WheatTech CEOs Are Addicted to Taking Needless Risk