According to CNBC, President Donald Trump pledged to bring gasoline below $2 a gallon within his first year in office, but the national average stood at $4.20 a gallon on Friday, nearly 40% above the same period last year. Diesel reached $6.32 a gallon, up about 70% over the year, while high jet-fuel costs have led airlines to raise fares. GasBuddy petroleum analyst Patrick De Haan said gas and diesel prices were on track to be the highest ever on an election day. Fuel prices have risen amid disruptions linked to the conflict involving Iran, including reduced oil flows through the Strait of Hormuz. Trump issued an order allowing truckers to use tax-exempt off-road diesel on U.S. highways and announced an $8 billion relief program for farmers affected by high fuel prices.