(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 BloombergStock Traders Bracing for Worst Shrug Off Hot CPI: Markets WrapOne of the Most Infamous Trades on Wall Street Is Roaring BackUS Core Inflation Tops Forecasts Again, Reinforcing Fed CautionChina Has Never Canceled This Many Ship