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Prices fell in all regions but the East Coast, where prices were flat, and the Central Atlantic, where the average price nudged just one-tenth of a cent higher. The largest drop was 2 cents in California, where diesel nevertheless remains the nation’s most expensive at $4.456 a gallon. The smallest declines were just a tenth of a cent in both New England and the Lower Atlantic regions. The nation’s least expensive diesel on average is $4.042 in the Midwest, although the Gulf Coast is close behind at $4.049.