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Context
What happened: Trump signed an executive order directing states to widen tax-exempt use of red-dyed diesel and consider waiving some fuel taxes, after ruling out a diesel export ban.
Key numbers: Average diesel was $6.32 a gallon on Monday, down 13 cents from the prior week but $2.63 above a year ago. Trump said a typical trucker saves over $100 per fill-up. Ten states with about a third of US diesel sales had already acted.
Why it matters: Diesel costs remain sharply higher than a year ago, and high fuel and grocery prices are a concern for rural voters ahead of the November midterms.