On-highway diesel fuel retail prices will average $3.89 a gallon this year and $3.93 in 2012, the U.S. Department of Energy forecast.
The national average price of $3.184 is the highest price since $3.288 the week of Oct. 27, 2008.
The national average price is 46.6 cents higher than the same week last year and the highest since $3.094 the week of May 17.
The on-highway diesel price increased this week, jumping 4.9 cents to $3 a gallon.
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