Diesel resumed its recent upward track following a pause last week, rising 4.9 cents to $3.116 a gallon, the highest nationwide pump average in six months, the Department of Energy said.
Gasoline also rose to its highest level in six months, gaining 5.9 cents to $2.865 a gallon, DOE said following its weekly survey of filling stations Monday.
Diesel was unchanged last week at $3.067 from a week earlier, but it has risen 18.5 cents since early September, with minor declines of less than a penny in just two of the past nine weeks.
The price is now 31.5 cents higher than the same week a year ago and is the highest since it was $3.127 on May 10, according to DOE records.
Gasoline is now 19.9 cents over the same week a year ago, and also at its highest level since May 10, when it averaged $2.905 a gallon.
Oil prices rose more than $5 last week on the New York Mercantile Exchange and closed the trading day Monday at $87.06 a barrel, a 25-month high, Bloomberg reported.
Each week, DOE surveys about 350 diesel filling stations to compile a national snapshot average price.