Farmers, truckers, and economists say cutting taxes on diesel may not ease record-high fuel prices. Prices have soared since the U.S. attacked Iran months ago, with diesel prices averaging $6.30 per gallon on Wednesday. Industry groups said they appreciate President Donald Trump's executive order expanding the use of off-road diesel, but many farmers already have access to it and truckers face challenges with varying state rules. The order defers the $0.24 federal tax per gallon until the end of the year, and experts warn that easing limits may increase competition for the dyed diesel.