If you've ever pulled into a gas station in the morning and seen a price, then stopped again in the evening and noticed it jumped — or dropped — by nearly fifty cents, you probably wondered what's going on. Here's the full explanation, from someone who actually lives it every day.
It Starts With Crude Oil and the Rack Price
Every morning, BP's wholesale terminal in Des Plaines, Illinois posts what's called the rack price — the price we pay per gallon before we've added freight, taxes, or a cent of margin. That rack price is driven almost entirely by the price of crude oil on the global market, which trades 24 hours a day. When crude moves, the rack moves. A $5/barrel swing translates to roughly $0.12–$0.15 per gallon at the pump within a few days. We have no control over this. We just watch it.
Taxes: The Biggest Fixed Cost Nobody Talks About
Before we make a dollar, Illinois and the federal government take more than $0.98 per gallon in taxes — state motor fuel tax ($0.483), federal excise ($0.184), Kane County ($0.05, rising to $0.08 in July 2026), underground storage tank fee, environmental fees, and more.
That's well over a dollar in combined taxes locked in before the price hits the sign. We can't negotiate it. It just is.
How Much Fuel We Have in the Ground
We run three underground tanks — Regular, Premium, and Diesel — holding just under 35,000 gallons max. What's in the ground matters for pricing because we paid a specific price for fuel already in our tanks. We blend costs across older and newer deliveries to figure out our true break-even on every gallon we sell. If we had to order at a high rack price, that forces the street price up. If we timed it right when the rack was cheaper, we have more room to hold prices lower.
The Fuel Truck: Capacity and Availability
Our fuel is delivered by McMahon Transport in trucks carrying up to 8,500 gallons across four compartments. There's a 24-hour lead time on orders and every gas station in northeastern Illinois is competing for the same trucks. Delivery timing also matters because Sunday and holiday deliveries carry additional surcharges — so we plan around those costs.
Geopolitics: The Factor We Can't Control
In 2026, the biggest driver of wild price swings has been the geopolitical situation near the Strait of Hormuz — through which roughly 20% of the world's oil passes. We've seen $0.40+ moves in a single day based on a missile strike or a diplomatic statement. We're not speculators. We're a local gas station trying to price fairly while keeping up with a market that doesn't slow down for anyone.
What This Means for You
When our price changes, it's because one or more of these factors moved — crude oil, delivery cost, taxes, blended inventory cost, or competitive positioning. Nobody here is getting rich on razor-thin margins. We're all just trying to keep the pumps running.
Check live prices before you pull in: amoco.fun
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