The current price is the highest since $3.482 in Oct. 20, 2008, and 56.2 cents above a year ago.
For a third consecutive week, the average weekly on-highway diesel price increased to a two-year high.
The current price is the highest since $3.288 in October 2008.
U.S. Department of Energy projects diesel to average $3.23 a gallon in 2011.
The national average price jumped 3.5 cents to $3.197, after falling 2.2 cents the previous two weeks.
The national average price fell 0.9-cent to $3.162, after falling 1.3 cents the previous week.
The national average price of $3.184 is the highest price since $3.288 the week of Oct. 27, 2008.
The national average price of $3.111 is the highest price in six months. The week of May 10, the price was $3.127.
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