Enter the current diesel price, your contract's base (peg) price, and your truck's real MPG to get your fuel surcharge per mile — and the total on any load. Pre-filled with the current EIA national diesel average so you can see today's number instantly.
FSC per mile = (current price − peg) ÷ MPG, floored at $0. Current price is pre-filled with the EIA national diesel average (~$5.35/gal, June 2026) — replace it with today's number or your region's price. Use diesel by state for regional prices.
A fuel surcharge (FSC) is the adjustable add-on that protects you when diesel rises. It's tied to a base (peg) price in your contract: below the peg there's no surcharge; above it, the surcharge grows as diesel climbs. The standard method is per mile: take the current diesel price minus the peg, divide by an assumed MPG, and you get the surcharge per paid mile. Most carriers reset it weekly using the U.S. Energy Information Administration (EIA) national average.
Example: at $5.35/gal current, a $1.25 peg, and 6 MPG → ($5.35 − $1.25) ÷ 6 = $0.68 per mile. The lower your real MPG, the higher your surcharge — because you burn more gallons per mile.
The national on-highway diesel average sat near $5.35/gallon in early June 2026, about $1.18 higher than a year earlier (EIA). At those prices, fuel surcharge is a large slice of a load's revenue — and a real MPG that's even half a mile per gallon better, or a fuel-card discount, drops straight to your bottom line. Chasing a bigger surcharge matters less than burning fewer gallons.
(Current diesel − base peg) ÷ MPG = surcharge per mile, updated weekly off the EIA national diesel average.
The diesel price above which the surcharge starts, set in the contract — classically ~$1.25/gal, though many schedules use a higher base.
Near $0.68/mile at a $5.35 diesel average, $1.25 peg, and 6 MPG (June 2026). Yours depends on your peg and real MPG.
Standard per-mile peg method; current diesel default is the EIA national on-highway average (~$5.35/gal, week of June 1, 2026). Sources: U.S. EIA Gasoline and Diesel Fuel Update. Last updated June 2026. Estimates for planning only. Built by TruckMargin.