U.S. diesel prices jumped above $5 a gallon on Tuesday, marking the highest level since December 2022, as the strain on global energy markets  from the war with Iran continues to ripple through the American economy. Diesel prices reached $5.04 a gallon, up from $4.78 a week ago and from $3.65 over a month ago, according to data from AAA . Diesel prices are rising as the war in the Middle East constrains the world's oil supply and drives up prices of Brent crude, the international benchmark,