If you’ve filled up your tank recently, you already know. The national average for a gallon of regular gas just crossed $4.12, and depending on where you live, you might be paying way more than that. Six weeks ago, gas was under $3. That’s more than a dollar per gallon increase in barely over a month. The reason is a war with Iran that most Americans didn’t see coming and a naval blockade in the Strait of Hormuz that’s choking off roughly one-fifth of the world’s oil supply.
Here’s what’s actually happening, what it means for your wallet, and what — if anything — you can do about it.
The Strait of Hormuz Is Basically Shut Down
If you’re not familiar with the Strait of Hormuz, think of it as the world’s most important bottleneck for oil and gas. Before the war started on February 28, more than 100 vessels passed through it every single day, carrying about 20% of the planet’s oil and natural gas. Now? On one recent Friday, exactly two ships made it through. Neither of them was carrying oil or gas.
Iran has been controlling what little traffic still moves through the strait, requiring prior vetting and authorization — and charging tolls of over $1 million per ship. One vessel reportedly paid $2 million just to pass through. The Iranian Revolutionary Guards have been collecting these payments in Chinese yuan, according to Lloyd’s List. A senior Iranian official said the strait is “firmly in our hands.”
That’s the backdrop. Now layer on what happened this past weekend.
The US Just Declared a Naval Blockade
On Sunday night, President Trump posted that he had “instructed our Navy to seek and interdict every vessel in International Waters that has paid a toll to Iran.” US Central Command (CENTCOM) followed up by announcing that naval forces would begin a blockade of all maritime traffic entering and exiting Iranian ports starting Monday at 10 a.m. ET.
CENTCOM said the blockade wouldn’t stop ships going to non-Iranian ports, but the practical effect is obvious. Shipping companies don’t want their billion-dollar tankers anywhere near a war zone. More than 600 ships were already stuck in the region as of Friday, including 154 loaded with oil. At least three tankers have been struck near the strait, and one off the coast of Oman was set on fire.
Iran’s parliamentary speaker responded on X, saying the “so-called blockade” would make Americans “nostalgic for $4–$5 gas.” The Islamic Revolutionary Guard Corps warned that any military vessels approaching the strait “will be dealt with harshly and decisively.”
Oil Prices Reacted Immediately
When markets opened Sunday evening, oil prices jumped more than 7%. Brent crude — the international benchmark — topped $103 a barrel. WTI, the US benchmark, hit $104.56. That’s more than 50% higher than where oil was before the war started.
To put that in perspective: oil was around $70 a barrel on February 27. It hit $120 during the worst of the fighting. It briefly dipped below $92 last week when a two-week ceasefire was announced. But those peace talks collapsed over the weekend — Iran’s uranium enrichment program was cited as the sticking point — and now we’re right back to triple digits.
JPMorgan Chase analysts wrote that “reopening the Strait has become the market’s most time-sensitive priority.” That’s Wall Street speak for: nothing else matters until ships can move through there again.
This Is Already Hammering Inflation
The March inflation numbers were rough. Consumer prices rose by 0.9% in a single month — compared to 0.3% in February. That’s the largest monthly uptick since May 2022. Gas prices drove most of it, with petrol up 21.2% and fuel oil increasing more than 30% in March alone.
The overall inflation rate jumped from 2.4% in February to 3.3% in March. That’s moving in the exact wrong direction from where the Fed wants it, and it means interest rate cuts that many Americans have been waiting on are probably off the table for a while.
Consumer sentiment has cratered. The University of Michigan’s Consumer Sentiment Index dropped to an all-time low of 47.6 in April, down from 53.3 in March. The decline cut across every age group, income level, and political party. “Many consumers blame the Iran conflict for unfavourable changes to the economy,” said Joanne Hsu, the survey’s director. Trump acknowledged in a Fox News interview that gas prices could be “the same or maybe a little bit higher” by the midterm elections.
The Government Is Draining the Strategic Petroleum Reserve
The International Energy Agency pulled the biggest lever it has: a record release of 400 million barrels of emergency oil from its 32 member countries. IEA Executive Director Fatih Birol called this “the worst energy crisis in history,” pointing out that during the 1970s oil crises, the world lost about 5 million barrels per day. Right now, 12 million barrels per day have been taken off the market.
The US has already started tapping its Strategic Petroleum Reserve. The Department of Energy just loaned 8.48 million barrels to four companies — Gunvor USA, Phillips 66, Trafigura Trading, and Macquarie Commodities Trading — in a second round of emergency releases. A first round moved about 45.2 million barrels. The total plan is to release up to 172 million barrels through 2027.
The SPR held about 415 million barrels before the war started. That’s the nation’s rainy-day fund for oil, and we’re spending it fast. Even after a presidential order to release oil, it takes about 13 days for those barrels to actually reach US markets.
It’s Not Just Gas — Everything Is Getting More Expensive
When oil prices spike, everything moves with them. Diesel and jet fuel have more than doubled. Airlines rerouting flights around closed Middle Eastern airspace are burning more fuel on longer paths and passing those costs along. Chemical and steel manufacturers in the US and Europe have imposed surcharges of up to 30%.
But here’s the one that should worry everyone: fertilizer. Over 30% of the world’s urea — a key ingredient in fertilizer — is produced from natural gas and exported from Gulf countries through the Strait of Hormuz. With that supply route closed, analysts are warning about rising food prices later this year and into 2027. The cost of raw materials for plastics, packaging, and pharmaceuticals is also climbing. One supply chain consultant said if the blockade extends past early May, “you will see prices all over the world spike for raw materials.”
Global LNG supply has been reduced by 20%, and Iran’s strike on Qatar’s Ras Laffan LNG facility — the world’s largest — caused damage that could take 3 to 5 years to fully repair. LNG spot prices in Asia jumped more than 140% after that attack.
The Peace Talks Failed — And That’s the Real Problem
Vice President JD Vance, special envoy Steve Witkoff, and Jared Kushner were in Islamabad meeting with Iranian leaders during the ceasefire. Those talks collapsed over Iran’s uranium enrichment program. The ceasefire technically runs until April 22, but the blockade announcement makes that feel like a formality.
Analysts with Eurasia Group said the blockade will “further discourage shipping through the strait, keeping volumes below 10% of the prewar level.” RBC Capital Markets analyst Helima Croft suggested Trump may be trying to pressure China into getting more involved in negotiations, since Iran exports much of its oil to Chinese refineries. But that’s a risky bet. If Iran retaliates — or if the Houthis in Yemen shut down Bab al-Mandeb, another critical shipping lane — analysts say oil could push past $150 a barrel.
Trump did say Monday that he was “called this morning by the right people in Iran” and that they want to work on a deal. Stocks ticked up on the comment. But we’ve been here before — the ceasefire was supposed to reopen the strait, and instead Iran started charging tolls.
What You Can Actually Do to Spend Less on Gas
You can’t control geopolitics, but you can squeeze a few more miles out of every gallon. According to experts from GasBuddy, AAA, and the Department of Energy, here are the things that actually make a difference:
Fill up on Sundays. A GasBuddy analysis found it’s consistently the cheapest day in most states. Avoid stations right off highway exits — they charge a premium because they can. Keep your tires properly inflated; underinflated tires can cost you up to 11 cents per gallon. Stop flooring it from every green light. Aggressive driving — speeding, hard braking, rapid acceleration — can lower gas mileage by 15% to 30% on the highway and up to 40% in stop-and-go traffic.
If your car only “recommends” premium but doesn’t “require” it, switch to regular. That alone could save you $20 to $30 a month at current prices. Use your AC sparingly. Some gas station chains offer their own credit cards with discounts of up to 10 cents per gallon. And if you’re near a military base or tribal land, their fuel stations often have lower prices due to tax exemptions.
None of that fixes a $4 gallon of gas. But when you’re filling a 16-gallon tank every week, saving even 30 or 40 cents a gallon adds up to real money over time. And based on everything happening in the Strait of Hormuz right now, high gas prices aren’t going anywhere soon.
