Why Is Gas So Expensive Right Now? (September 2026, Explained Simply)

If you're searching "why is gas so expensive right now" or "why are gas prices so high", here's the short answer: gas is expensive right now because crude oil is back around $100 a barrel, and it's back around $100 because the war with Iran has choked tanker traffic through the Strait of Hormuz — the channel that carries roughly a fifth of the world's oil. As of 10 September 2026 the AAA national average for regular is $4.27 a gallon, up 13 cents in a single week, versus $2.98 in late February before the conflict started. Diesel is expected to cross $6 a gallon for the first time ever. Below is the full breakdown — what's in the price of a gallon, the four things pushing it up, and what would have to change for it to come down. (Prices in this post are as of the date above; the sources linked update daily.)

What you're actually paying for in a gallon of gas

A gallon of gasoline is four costs stacked on top of each other, and only one of them moves fast:

• Crude oil — normally 50–60% of the pump price, and closer to 65% when crude is this high. This is the part that has exploded.
• Refining — turning crude into gasoline. Usually 10–20%, but it swings hard when refineries are stretched (see diesel below).
• Distribution and marketing — trucking it to the station and the station's own margin. Roughly 10–15%, fairly stable.
• Taxes — federal 18.4 cents plus state taxes ranging from about 9 cents to over 60 cents per gallon. Fixed, which is why prices differ so much by state.

The rule of thumb: every $1 move in a barrel of crude works out to roughly 2.4 cents per gallon at the pump. Crude has gone from the low $60s in February to about $96–$101 now. That's $35–$40 a barrel, or 85–95 cents a gallon — almost the entire increase you're seeing, before refining margins added the rest.

Reason 1: The Iran war and the Strait of Hormuz

This is the big one. The Strait of Hormuz is a 21-mile-wide channel between Iran and Oman through which roughly 20% of global oil supply moves by tanker. Since the US–Israel war with Iran began, Iran has repeatedly attacked commercial traffic in and around the strait, and traffic has been intermittent at best. In early September fighting escalated again — the US destroyed five Iranian crude tankers after attempted attacks on a US warship — and Brent jumped 3.4% to $101.21 while WTI settled at $96.05.

Oil is priced globally. It doesn't matter that the US produces most of its own crude — American barrels sell at the world price, and the world price is set by how much supply the market thinks it can count on tomorrow. When a fifth of seaborne supply is in doubt, every barrel everywhere gets more expensive. That's why gas went up in Texas even though Texas oil never goes near Hormuz.

Why did gas prices go up today? The pump lags crude

If you're asking why gas prices went up today, the answer is usually something that happened to crude a week or two ago. Gas stations buy fuel from distributors, who buy from refineries, who buy crude weeks in advance. So a spike in crude takes one to three weeks to fully show up at the pump, and the 13-cent jump in the week to 10 September was the market catching up to the early-September crude surge. It also means that if crude fell tomorrow, pumps would take just as long to catch up going the other way — a pattern economists call "rockets and feathers": prices rocket up and float down.

Reason 3: Refining is stretched, and diesel is dragging gasoline with it

Refineries can't run at more than about 95% of capacity for long, and the US has fewer of them than it did a decade ago. When diesel demand outruns diesel supply — as it has this year, with Middle East export refineries partly offline — refiners lean into distillate output and the whole margin structure widens. That's why diesel is heading for $6 a gallon and why gasoline hasn't gotten the usual post-summer relief. High diesel also feeds straight into freight costs, which is a big part of why the Dallas Fed has been tracking the war's effect on broader US inflation.

Why are gas prices going up again after Labor Day?

Prices dipped briefly in late August, so a lot of people are asking why gas prices are going up again. Gas is usually cheapest in the autumn: driving falls off after Labor Day, and refineries switch to cheaper winter-blend fuel from mid-September. This year both of those tailwinds are being swamped. Labor Day hit a record $4.15 for that weekend and has kept climbing since. GasBuddy's Patrick De Haan expects "our most expensive September, October and November, until something shifts with these geopolitical tensions".

Why does gas cost so much more in some states?

Two reasons: taxes and blends. California, Washington, Illinois and Pennsylvania levy the highest state gas taxes, and California and a few others also require a special low-emission gasoline blend that fewer refineries make. Texas, Mississippi and Oklahoma sit at the bottom. When the national average is $4.27, the spread between the cheapest and most expensive states is usually $1.50 or more. NBC's daily tracker shows the current state-by-state map.

When will gas prices go down?

Honestly: not until crude does, and crude won't until tanker traffic through Hormuz is reliable again. The EIA's latest outlook does not expect Middle East production to return to near pre-conflict levels until early 2027, and forecasts Brent averaging $87 for 2026 as a whole — which implies prices easing from today's ~$100 but not collapsing. Working against that, the IEA has cut its demand forecast by 2.5 million barrels a day for the year, the biggest drop since Covid, as high prices destroy demand. Signs that would point to relief:

• A ceasefire or a negotiated reopening of Hormuz — the single biggest possible move, likely worth $15–$25 a barrel within days.
• Strategic Petroleum Reserve releases or eased shipping restrictions, which take the edge off but don't fix supply.
• The winter-blend switch (from 15 September) and falling autumn demand, normally good for 15–30 cents by November.
• Demand destruction — if prices stay high enough for long enough, people drive less and the market rebalances the hard way.

The realistic base case is gas staying above $4 through the autumn, with any sharp drop tied to a headline out of the Gulf rather than the calendar.

What energy traders are watching

If you trade this rather than just pay for it, the pump price is the last thing to move. The instruments that lead it are crude futures (CL on NYMEX for WTI, Brent on ICE), RBOB gasoline futures (RB), and heating oil (HO) as the diesel proxy. The number that ties them together is the crack spread — the difference between the price of a barrel of crude and the products refined from it — and the crack is what's been screaming that refining, not just crude, is tight. Weekly EIA inventory data (Wednesday 10:30 ET) and any Hormuz headline are the scheduled and unscheduled volatility events, and a single tanker report can move CL $3 in minutes.

That kind of headline-driven tape is exactly where a trade journal earns its keep: the difference between a good CL trade and a lucky one is invisible in the P&L and obvious on the chart replay. Our guide to managing risk in trading covers sizing for a market that gaps like this one, and if you want the entry-to-exit clip of every trade recorded automatically off your TradingView chart, that's what TradeCut does.

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