The national average diesel fuel price was up one cent to $3.99 per gallon, 17 cents lower than last year at this time.
Prices increased in all regions of the nation except the Gulf Coast, where the price dropped a penny to $3.78 per gallon.
The largest increase was in the Rocky Mountains, where the price gained four cents to $3.91 per gallon. The Midwest price was $3.99 per gallon, up two cents from last week, and the East Coast price increased a penny to $4.13 per gallon. The West Coast price was up less than one cent to remain at $4.00 per gallon.