As of the last week in May, U.S. diesel fuel prices decreased in nearly every region. The Central Atlantic and Rocky Mountain regions experienced the only increases in the United States, with the Central Atlantic region seeing a $0.003 per gallon increase and the Rocky Mountain region seeing a $0.015 per gallon increase.
All other regions experienced decreases, with California experiencing the largest decline at $0.028 per gallon less than previous weeks and $0.184 per gallon less than a year ago.
National diesel costs are also declining. Diesel prices in the U.S. are $0.017 per gallon less than a year ago.