Average Cost of Diesel by State

Diesel prices vary widely across the U.S., and knowing the average cost in each state can help you plan routes, budget fuel, and negotiate rates. As of early 2026, the national average for on-highway diesel is around $3.85 per gallon, but state averages range from roughly $3.40 in Oklahoma to $4.60 in California. This guide breaks down the numbers, explains why prices differ, and gives you actionable steps to cut fuel costs this week.

Why Diesel Prices Vary by State

Several factors drive the price difference you see at the pump:

• State fuel taxes: Diesel excise taxes range from about $0.15 per gallon in Alaska to $0.68 in Pennsylvania (as of 2026). Combined state and federal taxes (federal is $0.244 per gallon) can add $0.40 to $0.90 per gallon.
• Regional supply and demand: States with high trucking volume or limited refinery capacity often see higher prices. The West Coast, for example, has fewer pipelines and stricter fuel blends, pushing prices up.
• Proximity to refineries: States near Gulf Coast refineries (Texas, Louisiana) typically have lower prices due to lower transport costs.
• Environmental regulations: California and other states require special low-emission diesel blends, which cost more to produce.
• Local market competition: In areas with many truck stops, prices may be more competitive.

Average Diesel Prices by State (2026)

Below is a table of approximate average on-highway diesel prices for each state as of January 2026. These are retail averages, so your actual cost will vary by location and volume discounts.

State	Average Price per Gallon
Alabama	$3.55
Alaska	$4.10
Arizona	$3.80
Arkansas	$3.50
California	$4.60
Colorado	$3.65
Connecticut	$3.95
Delaware	$3.75
Florida	$3.70
Georgia	$3.60
Hawaii	$5.20
Idaho	$3.75
Illinois	$3.90
Indiana	$3.70
Iowa	$3.55
Kansas	$3.50
Kentucky	$3.60
Louisiana	$3.45
Maine	$3.90
Maryland	$3.80
Massachusetts	$3.95
Michigan	$3.80
Minnesota	$3.60
Mississippi	$3.50
Missouri	$3.50
Montana	$3.70
Nebraska	$3.60
Nevada	$4.00
New Hampshire	$3.85
New Jersey	$3.75
New Mexico	$3.55
New York	$4.00
North Carolina	$3.65
North Dakota	$3.60
Ohio	$3.65
Oklahoma	$3.40
Oregon	$4.05
Pennsylvania	$4.15
Rhode Island	$3.90
South Carolina	$3.55
South Dakota	$3.60
Tennessee	$3.55
Texas	$3.45
Utah	$3.70
Vermont	$3.95
Virginia	$3.70
Washington	$4.30
West Virginia	$3.80
Wisconsin	$3.70
Wyoming	$3.65

Note: Prices are retail averages and can fluctuate with crude oil prices and seasonal demand. Check the U.S. Energy Information Administration (EIA) for weekly updates.

How to Find the Best Diesel Prices in Your Area

You can’t control state taxes, but you can control where you fill up. Here are practical steps you can take this week:

1. Use diesel price apps: Apps like Trucker Path, Fuelster, and GasBuddy (with truck filters) show real-time prices at nearby truck stops. Many are free and include filters for diesel and RV lanes.
2. Join loyalty programs: Major chains like Pilot Flying J, Love’s, and TA offer loyalty programs that give discounts per gallon. For example, Pilot Flying J’s myRewards Plus can save you $0.10 to $0.20 per gallon.
3. Buy in bulk with a fuel card: Fuel cards like EFS, Comdata, or WEX often have negotiated discounts at partner stations. Some cards offer up to $0.50 per gallon off at certain locations.
4. Plan your route around fuel stops: Use route planning software that includes fuel prices, such as TruckMap or PC Miler, to identify the cheapest stops along your route.
5. Fill up in low-tax states when possible: If you’re running through Oklahoma, Texas, or Louisiana, top off your tanks there. Just be mindful of your fuel budget and time.

Fuel Cost Impact on Your Bottom Line

Fuel is typically your largest variable cost, often 25% to 35% of operating expenses. A difference of $0.50 per gallon can add up to $2,000 or more per month for a truck that uses 4,000 gallons. For example, if you drive 10,000 miles a month and average 6 miles per gallon, you’ll use about 1,667 gallons. A $0.50 per gallon difference means $833 more or less per month.

To calculate your monthly fuel cost: divide your monthly miles by your average MPG, then multiply by the price per gallon. Keep a log of your fuel purchases to see where you can improve.

Frequently Asked Questions

Q: Why is diesel in California so much more expensive? A: California has stricter environmental regulations, higher taxes (about $0.68 per gallon in state excise tax), and a unique fuel blend that costs more to produce. Limited pipeline access also increases transport costs.

Q: Are diesel prices expected to rise or fall in 2026? A: The EIA projects diesel prices will average around $3.80 to $4.00 per gallon in 2026, with fluctuations based on global oil markets and refinery maintenance. Winter months often see higher prices due to increased heating oil demand.

Q: How can I reduce my fuel costs without changing routes? A: Focus on driving habits: maintain steady speeds, avoid idling (idling can burn 0.8 to 1 gallon per hour), keep tires properly inflated, and reduce aerodynamic drag by closing gaps and using trailer tails. These can improve fuel economy by 5% to 10%.

Q: Do fuel cards really save money? A: Yes, if you use them consistently. Many fuel cards offer discounts of $0.05 to $0.50 per gallon at participating stations. Compare the card’s fees and network coverage to ensure it fits your routes.

The Bottom Line

Diesel prices vary by state due to taxes, supply, and regulations, with averages ranging from $3.40 to $4.60 in the contiguous U.S. (Hawaii is higher). The key to saving money is to be proactive: use price apps, join loyalty programs, and plan your fuel stops. Even a $0.10 per gallon savings can add up to $200 per month for an average driver. Check the EIA website weekly for the latest national and state averages, and adjust your budgeting accordingly. Fuel is a cost you can control with the right tools and habits.