Diesel prices in Iowa jumped nearly 10 percent since last week, according to the Iowa Department of Agriculture and AAA-Iowa. As of Wednesday, Oct. 12, a gallon of diesel averaged $5.05, a 38-cent increase from last week and $1.75 higher than last year. Iowa diesel prices remain 11 cents below the national average of $5.16. A gallon of regular unleaded gasoline climbed two cents from last week to $3.71 per gallon, 64 cents over 2021 prices. Wholesale ethanol held steady at $2.16, and natural gas prices at the Henry Hub reporting site dropped 35 cents to $6.58 per MMBtu.