California has the most expensive diesel in the U.S. at an average of $8.42 per gallon, according to AAA.
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Diesel is over $6 in 49 states: Where prices are highest and lowest
The Hill
September 21, 2026 at 8:56 PM
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California has the most expensive diesel in the U.S. at an average of $8.42 per gallon, according to AAA.