For the total United States during 2017, the average retail price differential between regular and premium gasoline averaged 0.53 dollars per gallon ($/gal). In PADDs 1, 2, 3, and 4, the current differential is approximately doublewhat it was in 2010 and 2011 (0.50 $/gal - 0.55 $/gal versus 0.20 $/gal - 0.30 $/gal).