Guessing this won’t last long though…
Check it out:

On July 13, the U.S. average diesel fuel retail price fell below the average regular gasoline retail price for the first time since the week of August 10, 2009 (Figure 1). From August 2009 through June of this year, retail diesel fuel prices sold at an average premium of 34 cents per gallon (gal) over regular grade gasoline, with the premium reaching more than 90 cents/gal in January.