The EIA reported as of May 27, 2013 the national average diesel fuel price decreased one cent from last week to $3.88, two cents lower than last year. The average diesel fuels price on the Gulf Coast remained unchanged at $3.78 per gallon. The Rocky Mountain price increased two cents from last week to $3.86 per gallon. Down two cents, the West Coast price is now $3.99 per gallon. The average diesel fuel price on the East Coast is $3.86, one cent lower than last week.