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Diesel rose modestly after two straight declines, rising 0.4 cent to $3.90 a gallon, while gasoline dropped 1.1 cents, the Department of Energy reported.
Gas fell to $3.550 a gallon, its fourth consecutive decline, according to DOE records.
Diesel, which dipped 1.3 cents last week and 0.6 cent the prior week, had gained almost 10 cents in four previous weeks of increases. Despite the downturn, the price is 12.6 cents above the same week last year.
Crude oil declined 43 cents to finish at $106.86 a barrel Monday on the New York Mercantile Exchange, Bloomberg News reported.
Each week, DOE surveys about 400 diesel filling stations and 800 gasoline stations to compile national average prices.