It cost just a little more than a penny less per gallon to fuel a diesel school bus last week on average across the country, according to the U.S. Energy Information Administration. Gasoline prices also fell on average, despite climbing in some regions such as the Rocky Mountains and Gulf Coast.

Here are the latest gasoline and diesel fuel statistics:

U.S. Regional Diesel Fuel Prices as of June 26, 2023

• East Coast: $3.85

• Midwest: $3.73

• Gulf Coast: $3.51

• Rocky Mountain: $4.02

• West Coast: $4.41

U.S. Regional Gasoline Fuel Prices as of June 26, 2023

• East Coast: $3.40

• Midwest: $3.45

• Gulf Coast: $3.19

• Rocky Mountain: $3.73

• West Coast: $4.56

Uncertainty after the weekend's mercenary mutiny in Russia led oil markets to cautious trading due to concerns about that country's oil production.

“While some states saw big increases from last week, I expect those states to see a calmer week ahead," said Patrick De Haan, head of petroleum analysis at GasBuddy. "Other states saw prices fall, and some like Arizona fell significantly as some of the kinks in supply have improved there over the last few weeks. Ultimately, we could see the national average nudge a bit lower in the week ahead, should oil prices fail to rally. But, with developments including the Wagner group destabilizing and testing Russia, there can always be last-minute shifts that impact prices, which we continue to watch for and hope the market remains calm.”

The average price of diesel fuel for school bus fleets took a slight jump, climbing about 2 cents, while gasoline prices fell by roughly the same amount, according to the U.S. Energy Information Administration.

Diesel costs rose in all regions monitored by the federal government, while gasoline was cheaper in most places except the Rocky Mountain region, where it was up more than 1 cent.

Here are the latest gasoline and diesel fuel statistics:

U.S. Regional Diesel Fuel Prices as of June 19, 2023

• East Coast: $3.87

• Midwest: $3.74

• Gulf Coast: $3.53

• Rocky Mountain: $4.03

• West Coast: $4.43

U.S. Regional Gasoline Fuel Prices as of June 19, 2023

• East Coast: $3.42

• Midwest: $3.49

• Gulf Coast: $3.11

• Rocky Mountain: $3.72

• West Coast: $4.57

The price for diesel, although up slightly on average, remains nearly $2 cheaper than the same time in 2022. Gasoline is down nearly $1.39 compared to last year.

"While the uncertainty over the direction of the economy is a major player in preventing oil's rise, inventories of oil and gasoline do remain tight, preventing much additional downward movement as well," said Patrick De Haan, head of petroleum analysis at GasBuddy. "We'll have to see which of those factors emerges as a winner to predict when the next large movement in prices could be. We're also seeing more tropical activity in the Atlantic that could pose challenges in the weeks ahead as hurricane season ramps up."

The average price for a gallon of gasoline went up more than 5 cents in the United States during the past week, according to the Energy Information Administration. Meanwhile, diesel's cost decline showed signs of leveling off due to increases in the East Coast and Gulf Coast regions.

Both gasoline and diesel prices remain below last year's levels at this time - $1.41 and $1.92 respectively.

Here are the latest gasoline and diesel fuel statistics:

U.S. Regional Diesel Fuel Prices as of June 12, 2023

• East Coast: $3.86

• Midwest: $3.72

• Gulf Coast: $3.49

• Rocky Mountain: $4.01

• West Coast: $4.42

U.S. Regional Gasoline Fuel Prices as of June 12, 2023

• East Coast: $3.43

• Midwest: $3.51

• Gulf Coast: $3.14

• Rocky Mountain: $3.71

• West Coast: $4.58

The higher prices may be driven by demand putting pressure on supply, as consumers for the third straight week went over 9-million barrels per day.

"With the Fed meeting this week to potentially alter interest rates again, we could see some turbulence in oil markets, potentially impacting states where gas prices were quiet this week, while the states that saw a big jump last week could see some moderate relief in the week ahead," said Patrick De Haan, GasBuddy's head of petroleum analysis. "The good news has continued for average diesel prices, which again fell last week to their lowest since early 2022, helping to relieve some pressure on hard-hit consumers of diesel."

Gasoline prices started the month of June down an average of 3 cents for school bus fleets across the United States, while the cost of a gallon of diesel fell nearly 6 cents, according to the Energy Information Administration.

Compared to the same period in 2022, gasoline is down nearly $1.34 and diesel has dropped about $1.91. But recent moves by Saudi Arabia suggest that trend may reverse in time.

Here are the latest gasoline and diesel fuel statistics:

U.S. Regional Diesel Fuel Prices as of June 5, 2023

• East Coast: $3.85

• Midwest: $3.73

• Gulf Coast: $3.47

• Rocky Mountain: $4.04

• West Coast: $4.47

U.S. Regional Gasoline Fuel Prices as of June 5, 2023

• East Coast: $3.41

• Midwest: $3.43

• Gulf Coast: $3.06

• Rocky Mountain: $3.65

• West Coast: $4.52

OPEC+ announced on June 4 that it would extend reduced production of crude oil through 2024, leading the EIA to forecast global oil inventories falling slightly in the next five quarters, and that could mean higher prices, "notably in late 2023 and early 2024."

Said Patrick De Haan, head of petroleum analysis at GasBuddy: "Last time OPEC+ agreed to cut production, it led to a temporary rally in the price of oil, but as global oil demand hasn’t been as strong as expected, the cut failed to hold oil prices up. OPEC+ and Saudi Arabia are likely hoping that the rise in oil prices will stick longer this time, as the Saudi economy relies on oil prices north of $81 per barrel. It’s likely that, as a result of the production cut, oil prices could rally this week, pushing gasoline prices higher as early as mid-week."

Keep up with fleet fuel prices throughout the month by checking here for regular updates. We’ll post new information when it’s available!

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