Diesel likely will cost 41 cents more on average during 2011 than it did during 2010.
U.S. Department of Energy projects diesel to average $3.23 a gallon in 2011.
The price is 30.9 cents higher than a year ago.
The national price dipped less than 1 cent to $2.931 in the latest week.
The national price declined 1.9 cents to $2.938 in the latest week.
The national price declined 2.2 cents to $2.957 in the latest week.
The national price fell 1.2 cents to $2.979 in the latest week.
For 2011, EIA forecasts continual steady increases for an average of $3.14 a gallon for the year.
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