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 national average price is 35 cents higher than the same week last year.
The price rose 0.4 cent to $3.078 in the latest week.
Diesel will average $2.95 this year and $3.12 in 2011, the agency said.
For the first time in 17 months, the national average retail price of a gallon of diesel topped $3.
For the first time in six weeks, the national average retail price of a gallon of diesel fell this week.
Diesel price is at the highest level since November 2008.
Compared with a year ago, the national average price is 90.7 cents a gallon higher.
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