# DOE Diesel Falls 15.1 Cents to $5.059, All Regions Lower _Jun 15, 2026_ > The US on-highway diesel index shed 15.1 cents to $5.059/gal on the week of June 15, trimming about $11.62 from a 500-mile haul at the stated 6.5 mpg reference. Every region moved lower. The index sits 34% above its 5-year median. The DOE number fell **15.1 cents** to **$5.059/gal** on the week of June 15, per EIA's weekly on-highway diesel survey. At the stated 6.5 mpg reference, that is **77.8 cents a mile**, trimming about **$11.62** from the fuel cost of a 500-mile haul. The index sits 34% above its 5-year median for this calendar week. [Chart: Diesel fuel cost per mile (at 6.5 mpg)](https://mondaydiesel.com/costpermile/diesel-cost-per-mile) ([data](https://mondaydiesel.com/costpermile/diesel-cost-per-mile.md) — chart image: https://mondaydiesel.com/charts/costpermile/diesel-cost-per-mile/chart.png) - **California on-highway diesel:** $6.713/gal, down 3% on the week, 38% above its 5-year median per EIA's survey. The highest pump price in the survey. - **West Coast (PADD 5):** $6.074/gal, down 3% on the week, 37% above its 5-year median. The West-vs-Gulf gap stands at 142.8 cents/gal over the Gulf Coast (PADD 3). - **PADD 5 less California:** $5.519/gal, down 4% on the week, the largest percentage retreat among all tracked regions. Sits 36% above its 5-year median. - **Central Atlantic (PADD 1B):** $5.503/gal, down 1% on the week, the shallowest weekly decline in the survey. - **Gulf Coast (PADD 3):** $4.646/gal, down 3% on the week, the lowest regional price in the survey and 33% above its 5-year median. Gulf Coast ULSD spot closed at $3.218/gal on June 15 and New York Harbor ULSD at $3.278/gal, per EIA's daily spot series (daily wholesale, untaxed). The US pump price sits $1.841/gal over Gulf Coast spot. That gap includes fuel taxes and the full distribution layer. It is a retail-layer proxy, not a station margin. --- Canonical URL: https://mondaydiesel.com/issues/2026-06-15