The on-highway average diesel fuel price in the United States for the week of March 11, 2019 is $3.079 per gallon. This price is slightly higher than the previous week of $3.076. Hopefully, the market will stabilize and show a decline in the coming weeks. California remains the highest region in the country at $3.778 per gallon. In contrast,the Gulf Coast Region is the most economical area to fill up at $2.881 per gallon.