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Diesel will average $3.90 a gallon this year, the Department of Energy said, boosting its most recent price forecast by 4 cents.
Average monthly prices will fall into the $3.80s beginning in July, DOE said in its monthly short-term energy outlook released June 10.
Diesel’s $4 per-gallon March average was the year’s peak, and the price will slide into the mid-$3.80s for the rest of the year until December, when it will decline to $3.81, the report said.
Diesel will average $3.85 in the second half of the year, DOE’s Energy Information Administration said.
Gasoline, meanwhile, will average $3.50 a gallon this year, up 3 cents from last month’s forecast.
Both prices would be slightly lower than a year ago, when diesel averaged $3.92 and gas averaged $3.51.