The diesel futures market has been trading in a fairly tight range, and it is showing up in relative stability at the pump.
The weekly average retail diesel price published Monday by the Department of Energy/Energy Information Administration, used for most fuel surcharges, rose 0.5 cents per gallon to $3.665. That follows an increase last week of 0.1 cents a gallon. One-tenth of a cent is the smallest increment the price can move each week.
In the past 10 trading days, the price of ultra low...