Isn't great to have diesel lower than gas for a change! I filled my semi in Lasalle, IL Thursday, and with the available discounts on top of lower pump prices now, I paid $2.11 a gallon for diesel. Factor out the total state fuel tax, which is only paid by me on fuel used within the state, and the actual price for the diesel was around $1.70 a gallon.
One thing that gets missed in the pricing around the country, diesel and gas are taxed at different rates. That explains some of the differences. Even on a Federal level, 18.4 cents a gallon on gas, 24.4 cents a gallon on diesel. States are all over the place. Some state fuel taxes are borderline criminal.
I know my spreadsheets for my business sure show the lower diesel pricing effect.