March 10 (UPI) -- The average price of a gallon of unleaded gas in the United States hit $3.54 on Tuesday as the Trump administration continues military action against Iran. AAA reports the current average price for fuel is higher across all grades than it was a year ago. Diesel fuel is up more than 10 cents over Monday's average, reaching $4.78 per gallon. Prices are highest on the West Coast, as they typically are, with the highest average cost of a gallon of unleaded gas at $5.29 in