How Diesel Delivery Is Priced: Rack Prices, Delivery Fees, and Taxes Explained

If you’ve compared fuel delivery quotes, you’ve probably noticed they don’t look like the price on a gas station sign. Commercial fuel is priced differently, and two quotes that look close at first glance can be built in completely different ways. Understanding how pricing works makes it much easier to compare suppliers, spot a padded quote, and negotiate a better deal.

It Starts at the Rack

Most commercial fuel pricing is built on the rack price: the wholesale price of fuel at a distribution terminal, where tanker trucks load up. Rack prices change daily based on crude oil, refining, and regional supply and demand. Industry services such as OPIS publish rack price data, which many suppliers use as their benchmark.

Retail station prices start from the same wholesale fuel, but by the time it reaches the pump, the station has added its own margin, operating costs, and card processing fees. Buying close to the rack is how commercial buyers avoid those layers.

The Building Blocks of a Delivered Price

A typical delivered diesel price breaks down into four parts:

Rack price: the wholesale cost of the fuel on the day it’s loaded.
Delivery fee: the cost of getting fuel from the terminal to your site. Depending on the supplier, this is either a flat fee per delivery or folded into the per-gallon price.
Supplier margin: the provider’s markup, either a fixed amount per gallon or built into the delivered price.
Taxes: federal excise tax (24.4 cents per gallon on on-road diesel) plus state taxes. Dyed off-road diesel is exempt from road taxes when used legally in off-road equipment.

When you request quotes, ask suppliers to break the price into these parts. If a quote is a single number with no breakdown, you can’t tell whether a low price comes from a thin margin or a temporary dip in the rack.

Flat Delivery Fee vs. Per-Gallon Markup

This is the detail that trips up most buyers. Some suppliers charge a separate, flat delivery fee and keep the per-gallon price close to the rack. Others quote no delivery fee at all and bury their margin in the per-gallon rate.

Neither approach is automatically cheaper. A flat fee spread across a large delivery adds very little per gallon, so it usually favors high-volume buyers. A per-gallon markup can look attractive on a small order but becomes expensive as volume grows. The only way to compare fairly is to calculate your total cost at your actual order size.

Common Pricing Models

Cost-plus (rack-plus): You pay the daily rack price plus a fixed margin per gallon. It’s transparent and tracks the market, which makes it a common model for commercial accounts.
Fixed price: You lock in a price for a set period. That gives you budget certainty, but if the market drops, you pay above market.
Delivered price: You get one all-in number per delivery. It’s simple to understand, but harder to compare across suppliers.

What Moves Your Price Up or Down

Gallons per delivery: Usually the biggest factor. Fixed costs spread over more gallons lower your per-gallon cost.
Scheduled vs. one-time orders: Regular, scheduled deliveries fit into existing routes. One-time and emergency orders typically cost more.
Site and location: Drive time from the terminal, site access, and security checkpoints all add time, and time is cost.
Number of sites: Consolidating several locations with one supplier can improve your leverage.

Questions to Ask Any Fuel Supplier

What rack or index is your pricing based on?
Is your delivery fee separate, or built into the per-gallon price?
Is your margin fixed per gallon or variable?
Are there minimum orders or contract terms?
Are deliveries metered, with itemized tickets?

The Bottom Line

Fuel pricing makes sense once you see the parts behind it. Before signing with a supplier, get a quote that separates the fuel from the service, run the math at your real order size, and compare total cost rather than the headline per-gallon number. For a deeper look at how these factors play out in practice, this breakdown of fuel delivery pricing walks through delivery fees, volume, and when mobile fueling makes sense and when it doesn’t.