Diesel Just Hit a Record. Here's Why You Feel It at the Grocery Store, Not Just the Pump.

Why gas and diesel prices jumped

The short version is oil, and the reason oil went up is the conflict in the Middle East.

Since the fighting involving Iran began earlier this year, shipping through the Strait of Hormuz, one of the most important routes for oil in the world, has been disrupted. When oil can't move freely, supply gets tight and prices rise. Brent crude, a global benchmark, pushed toward $106 a barrel in mid-September after attacks on shipping in the strait and a drone strike that temporarily shut a major Saudi pipeline.

Gasoline and diesel are made from crude oil. So when crude goes up, both go up. But diesel has been hit harder, for a few reasons:

• Refineries. Key refinery capacity around the world has been offline, which squeezes supply of diesel and similar fuels.
• Demand. Diesel powers trucks, trains, ships, farm equipment, and construction. That demand doesn't drop much when prices rise, because the economy still has to move goods.
• Tight inventories. Traders are paying record premiums to get immediate supply at the main U.S. storage hub, which tells you physical supply is tight right now.

Diesel has rallied more than 80% this year, according to Bloomberg. That's not a small bump.

Why diesel shows up in your grocery bill

This is the part most people miss.

Almost everything you buy spent time on a truck. Food, clothes, building materials, medicine, the package on your porch. When diesel costs more, the cost of moving all of it goes up. And businesses don't eat that cost forever. They pass it along.

One truck driver in South Florida told a local news station that filling a 200-gallon tank now costs between $1,200 and $1,500. Multiply that across every truck on the road, every delivery, every farm, every construction site, and you start to see why fuel prices ripple into everything.

It doesn't happen overnight. Fuel costs tend to show up in other prices with a delay, sometimes weeks, sometimes months. So even if prices at the pump settle down, you might keep seeing higher prices on other things for a while after.

In plain terms: you pay for diesel whether you buy it or not. It's baked into the price of everything that rides on a truck.

What fuel prices are doing to inflation

You can see this clearly in the government's inflation numbers.

In August, the Consumer Price Index showed prices up 3.4% over the past year. Gasoline alone was up 27.4% year over year. It was the single biggest driver of inflation that month.

But here's something interesting. If you strip out food and energy, you get what's called core inflation. Core inflation in August was 2.4%, the lowest since early 2021. So a lot of the inflation we're feeling right now is coming from energy specifically.

That matters for two reasons.

First, energy prices can come down fast if the supply situation improves. If oil drops, headline inflation could cool off more quickly than people expect.

Second, the longer energy stays high, the more it seeps into core prices through shipping, airfare, and business costs. That's exactly what the Federal Reserve is worried about.

How this connects to interest rates

On September 16, the Federal Reserve raised interest rates for the first time since 2023. A big reason was energy.

The Fed can't pump oil or reopen a shipping lane. But it can try to keep high energy prices from turning into a long-lasting inflation problem. The way it does that is by making borrowing more expensive, which cools spending.

So fuel prices don't just hit your tank and your groceries. They're part of why credit card rates are rising, why mortgage rates just crossed 7%, and why the 10-year Treasury yield is at its highest level since 2007.

It's all connected. Oil goes up, inflation goes up, rates go up.

What it means for people on a fixed income

If you're retired, or getting close, this hits differently.

When you're working, your pay can sometimes catch up with rising prices through raises. When you're living on a fixed income, like a pension, Social Security, or a set withdrawal from savings, rising prices shrink what that income can buy.

A few things worth knowing:

Social Security

Social Security benefits get a cost-of-living adjustment every year based on inflation. The 2027 adjustment will be announced on October 14. Estimates over the summer have ranged from about 3.2% to 3.6%, which would be higher than the 2.8% increase for 2026. Higher energy prices are a big part of why.

That helps. But it's based on a broad measure of prices. If your personal budget leans heavily on driving, or on groceries, your own inflation might be higher than the official number.

Pensions

Not every pension adjusts for inflation the same way. Some adjust by a set amount, some adjust based on a formula, and some don't adjust at all. It's worth knowing exactly how yours works, so you know how much of a rising-price environment it protects you from.

Your spending plan

Retirement budgets built a couple of years ago may have assumed gas around $3 a gallon. At $4 or more, a household driving a lot can feel it. That doesn't mean your plan is broken. It means it's worth updating the fuel line in your budget with real numbers.

Let's put real numbers on it

Here's a simple hypothetical.

Let's say your household drives about 1,000 miles a month, and your car gets about 25 miles per gallon. That's 40 gallons of gas a month.

If gas is $1.14 higher than last year, that's about $45.60 more per month, or roughly $547 more per year, just on fuel.

For some households, that's an annoyance. For others, it's the difference between a comfortable month and a tight one. And that's before the higher grocery and shipping costs that follow from diesel.

The point isn't to panic about $547. It's to see it clearly, so it doesn't quietly come out of your savings without you noticing.

How long do price spikes usually last?

Nobody can tell you how long this one will last. But history gives some perspective.

In 2008, gas prices climbed above $4 a gallon over the summer. By the end of that year, they had fallen below $2, as the financial crisis crushed demand. The spike was real, and then it reversed hard.

In 2022, after Russia invaded Ukraine, the national average for gas topped $5 a gallon in June, and diesel set its old record of $5.82. By the end of that year, prices had come down a lot.

So fuel spikes have a history of not lasting forever. They also have a history of being painful while they last, and of leaving some prices higher even after fuel comes back down. Groceries and shipping costs don't always fall as fast as they rose.

That's why I'd plan around today's prices without assuming they're permanent. Budget for what things cost now. Don't lock yourself into long-term decisions that only make sense if prices stay here forever. And don't assume relief is right around the corner either.

A word for people who drive for work

A lot of public employees drive more than most people. Deputies and officers heading to a shift, teachers covering long commutes to the schools where they work, state and county workers covering big territories. Some have take-home vehicles. Many don't.

If you drive a lot for work, a few things are worth checking.

Mileage reimbursement. If your employer reimburses mileage for work travel, make sure you're actually submitting for it. It's easy to let small trips slide, and they add up.

Your commute math. If you've been weighing a job change, a transfer, or a move, fuel costs are part of the real math. A job that pays a bit more but adds 40 miles a day of driving may not come out ahead right now.

Tax rules. Regular commuting between home and your normal workplace generally isn't deductible for most employees. Rules for business travel are different. If you're not sure how the rules apply to you, a tax professional can tell you.

Practical ways to adjust

None of these are magic. Most of them are just about paying attention. But paying attention adds up.

Update your budget with today's prices

Look at what you actually spent on gas last month, not what you think you spend. Use that as your budget line for the next few months. If prices come down, great. You'll have a little extra.

Compare prices before you fill up

Prices can vary a lot from station to station, even in the same area. Free apps and websites that track local gas prices can help you find a cheaper station nearby. Just don't drive 10 miles out of your way to save 5 cents. That math doesn't work.

Look at fuel rewards you already have

Some grocery stores, warehouse clubs, and credit cards offer fuel discounts or rewards. If you already shop somewhere that offers them, it's worth using them. If you'd have to spend more to earn them, it usually isn't worth it. And if a rewards card leads you to carry a balance at 20% interest, that wipes out any fuel savings many times over.

Combine trips

This one sounds basic, but it's one of the few things you fully control. Fewer separate trips means less fuel. Batching errands into one trip can cut your monthly mileage more than you'd think.

Check your tires

Underinflated tires can lower your fuel economy. Keeping them at the recommended pressure is a small, free habit. The recommended pressure is usually on a sticker inside the driver's door.

Watch the grocery side too

Since diesel costs show up in groceries, it's worth paying attention there as well. Store brands, buying in bulk for things you actually use, and planning meals around what's on sale can help offset rising food costs.

Don't make a big decision based on one bad month

When gas prices spike, some people start thinking about trading in their car for something more efficient. Sometimes that makes sense. Often it doesn't. A new car payment, higher insurance, and taxes can easily cost more than you'd save on gas, especially if the price spike doesn't last. It's worth running the full numbers before making a big move because of a short-term price jump.

What could change prices from here

I want to be honest here. Nobody knows where fuel prices go next. But there are a few things that could push them one way or the other.

What happens in the Strait of Hormuz

This is the big one. If shipping through the strait returns to normal, oil prices could come down, and gas and diesel would follow over time. If disruptions continue or get worse, prices could stay high or rise further. Talks between the U.S. and Iran have made little progress so far.

A possible diesel export ban

The administration has been weighing restrictions on U.S. diesel exports to try to keep more fuel at home and bring prices down. The oil industry has warned that a ban could backfire and make the global fuel shortage worse. It's not clear yet what will happen, or how it would play out at the pump.

Hurricane season

We're in Florida, so we know this one. Hurricanes can disrupt refineries along the Gulf Coast and cause temporary price spikes, especially in the Southeast. Hurricane season runs through November.

The midterm elections

Fuel prices have become a political issue heading into the November elections. That can bring policy announcements, but it doesn't guarantee lower prices.

What it means for your investments

A lot of people ask me whether they should buy energy stocks when oil is up, or sell everything when inflation rises. I'm not going to tell you to do either.

Here's what I'll say instead. Energy has been the best-performing sector of the stock market this year, up about 43% as of early September. Other parts of the market, like consumer spending stocks, have lagged. That's a pattern that often shows up when fuel prices spike.

But chasing whatever did well recently is one of the most common mistakes investors make. By the time something is in the headlines for being up 40%, a lot of the move may already be behind it. And energy prices can reverse quickly when the supply situation changes.

A diversified plan is built to hold up through different environments, including ones where energy is soaring and ones where it's falling. The fuel spike is a good reason to look at your plan. It's not usually a good reason to rebuild it.

What I'm not going to do

I'm not going to tell you gas prices are about to drop. And I'm not going to tell you they're headed to $6. I don't know that, and neither does anyone who tells you otherwise. Oil prices are tied to a conflict that nobody can predict.

What I will tell you is that you have more control over how prices affect you than it feels like. You can't control what a barrel of oil costs. You can control your budget, your driving habits, your grocery list, and how much of a cushion you keep.

When it comes down to it, the households that get hurt most by a price spike usually aren't the ones spending the most on gas. They're the ones with no room in their budget when something costs more than expected.

The short version

• Florida gas averaged about $4.24 a gallon this week, $1.14 more than a year ago.
• Diesel hit a national record of $6.39 a gallon earlier this month.
• Diesel moves almost everything you buy, so higher diesel prices show up in groceries and shipping.
• Gasoline was up 27.4% over the past year in August and was the biggest single driver of inflation.
• Energy prices are part of why the Fed raised interest rates in September.
• Fixed incomes feel rising prices the most. The 2027 Social Security COLA is announced October 14.
• Update your budget with real numbers and keep a cushion. Avoid big decisions based on a short-term spike.

If rising costs have you wondering whether your retirement budget still holds up, I'm happy to walk through the numbers with you.

Frequently asked questions

Why are gas prices so high in 2026?

Gas prices rose mainly because oil prices jumped after the conflict involving Iran disrupted shipping through the Strait of Hormuz. Tight refinery capacity has added pressure, especially on diesel.

What is the average gas price in Florida right now?

AAA reported Florida's average price for regular gas at about $4.24 a gallon in late September 2026, about $1.14 higher than a year earlier. Prices change daily and vary by area.

Why does diesel affect grocery prices?

Most goods, including food, are transported by trucks that run on diesel. When diesel costs more, shipping costs rise, and businesses often pass some of that cost on to consumers over time.

How do gas prices affect inflation?

Gasoline is part of the Consumer Price Index. In August 2026, gasoline prices were up 27.4% over the past year and were the largest single contributor to overall inflation of 3.4%.

Will gas prices go down soon?

It depends heavily on whether oil shipping through the Middle East returns to normal, along with refinery capacity, policy decisions, and hurricane season. No one can reliably predict short-term fuel prices.

Educational content only. Not individualized investment, tax, or legal advice. Examples are hypothetical and for illustration only. Past performance does not guarantee future results. Benowitz Wealth Management is a brand of Joy Financial Group LLC, a Florida state-registered investment adviser. Consult a qualified tax professional regarding your specific situation.

Neither Joy Financial Group LLC nor Benowitz Wealth Management is affiliated with, endorsed by, or employed by the Florida Retirement System, the Florida Division of Retirement, the State Board of Administration of Florida, MyFRS, or any government agency. FRS members may obtain free, unbiased guidance from the MyFRS Financial Guidance Line at 1-866-446-9377.