Live Diesel Price — Instant Trip Cost
Calculate exactly how much fuel will cost for your next trip. Uses the live EIA national average diesel price updated weekly. See cost per mile and a price sensitivity table.
Reviewed by TruckLeap Editorial Team — Trucking Industry Researchers & Writers
Data current as of
Save on fuel with a fleet fuel card. Owner-operators typically save $0.10–$0.20/gallon off pump price — that's $1,000–$2,000/year at 10,000 miles/month.
Fuel Cost Benchmarks (Semi-Truck)
| Average diesel price (Apr 2026) | $3.85–$4.10/gal | EIA weekly retail diesel |
| Average fuel MPG (semi) | 6.0–7.5 MPG | loaded, highway |
| Fuel cost per mile (loaded) | $0.52–$0.68/mile | at $4.00/gal |
| Fuel as % of revenue | 25–35% | owner-operator benchmark |
Sources: U.S. Energy Information Administration weekly diesel prices, ATBS fuel data
Quick Answer
At 6.5 MPG and $3.80/gallon, every 100 miles costs $58.46 in fuel alone. Improving your fuel efficiency by just 0.5 MPG saves $4.49 per 100 miles — on 10,000 miles per month, that's $449/month or $5,388 per year. Enter your trip distance, MPG, and current diesel price below to get the exact fuel cost.
Why a $0.50 swing at the pump can make or break your month
Diesel prices don't move in a straight line, and as an owner-operator, you feel every cent of that movement directly. When the national average was sitting at $2.80/gallon in early 2021, a truck getting 6.5 MPG was paying $0.431/mile in fuel. By June 2022, when diesel hit $5.81/gallon, that same truck was paying $0.894/mile. That's a $0.463/mile increase — on a 10,000-mile month, your fuel bill went from $4,310 to $8,940. The loads that paid $2.50/mile in 2021 suddenly weren't covering operating costs.
This is why fuel cost per mile is the single most important number in your operating cost stack. You need to know it before you accept a load, not after you've already burned the fuel.
Here's how to model the impact quickly. Take your monthly mileage, divide by your MPG to get monthly gallons consumed. Then multiply those gallons by the price change. A driver running 10,000 miles/month at 6.5 MPG burns about 1,538 gallons/month. Every $0.10 increase in diesel costs that driver $153.80/month more. A $0.50 spike costs $769/month. A $1.00 spike — which happened repeatedly between 2021 and 2023 — costs $1,538 more per month.
Most rate negotiations don't happen monthly. If you locked in a contract rate in January and diesel spikes in March, you're eating that difference unless your contract includes a fuel surcharge clause tied to the EIA DOE price.
The gap between 5.5 MPG and 6.5 MPG sounds like just one number, but the financial difference is significant. At $3.80/gallon on a 10,000-mile month:
Going from 5.5 to 6.5 MPG saves you $1,063/month — $12,756/year — without running a single extra mile. That's a truck payment for some rigs.
Before accepting any load, especially a long-haul that spans multiple fuel fill-ups, run the scenario at diesel plus $0.50 from current prices. That's your downside case. If the load still works at that price, accept it with confidence. If it doesn't, you need either a higher rate or a built-in fuel surcharge.
The sensitivity table in this calculator does exactly this automatically. The fuel cost at current prices is your baseline. The numbers above it are your risk exposure. Know your break-even fuel price — the diesel price at which the load stops making money — before you commit.
Field-tested strategies from drivers who've moved the needle on MPG
There's no shortage of fuel efficiency advice online, but most of it is written by people who've never run a loaded 80,000-pound truck in August heat through the mountains. Here's what actually moves the needle.
Every 5 mph above 60 costs approximately 7% more in fuel. That's not an estimate — it's been verified repeatedly in real-world fleet testing. At 65 mph vs. 60 mph, a truck burning 1,538 gallons/month at 6.5 MPG would instead burn about 1,645 gallons/month at roughly 6.1 MPG — an extra 107 gallons, or about $407/month at $3.80/gallon.
At 70 mph, you're looking at roughly 5.9 MPG, burning 1,695 gallons/month — $237 more per month than driving 65. The difference between 60 and 70 mph is about $600/month in fuel on a 10,000-mile run. Over a year, that's $7,200. Fuel savers like cruise control and governed speed settings typically pay for themselves in fuel savings alone within weeks.
A typical diesel engine burns approximately 0.8–1.0 gallon per hour at idle. If you idle 8 hours per night (not uncommon for sleeper cab drivers who need climate control), that's 8 gallons/night × $3.80 = $30.40 per night, or roughly $912/month for a driver running 30 nights. Per year, that's $10,944 in fuel to idle.
An APU (Auxiliary Power Unit) or a diesel-fired bunk heater costs $3,000–$8,000 installed but burns 0.1–0.2 gallons/hour — cutting idle fuel consumption by 80–90%. At $912/month in idle fuel savings, the payback on an APU can be as short as 4–9 months. Battery-powered HVAC systems have higher upfront costs but eliminate diesel burn entirely during idle.
Under-inflated tires increase rolling resistance. According to FMCSA research, tires inflated 10 psi below optimal reduce fuel economy by 0.5–1.0%. On 18 tires, that adds up. Proper tire inflation — checked cold before each day's run — is one of the lowest-effort, highest-return fuel efficiency practices available. Wide-base single tires (super singles) also reduce rolling resistance versus dual tires by reducing the total tire contact patch.
Fuel consumption on mountainous terrain can be 20–30% higher than flat interstate. When planning routes, particularly in the Rockies, Appalachians, or Cascades, model your fuel cost at a lower MPG — 5.0–5.5 for loaded flatbed or reefer in steep terrain. This calculator lets you adjust MPG freely, so run the mountain route at 5.5 MPG and the flat route at 7.0 MPG to see the actual fuel cost difference, then weigh it against tolls and total drive time.
Side skirts, trailer tails, and aerodynamic cab extenders have been shown to improve MPG by 2–5% in real-world testing. At 10,000 miles/month and $3.80/gallon, a 3% fuel improvement saves $175/month or $2,100/year. Most aerodynamic add-ons cost $500–$2,000 installed, giving you a payback period of 3–12 months.
What your equipment actually costs to fuel — and how it compares across freight types
Your equipment type is one of the biggest determinants of your fuel cost per mile. Two drivers running the same 500-mile lane can have fuel costs that differ by $50–$100 because one runs a loaded reefer and the other runs an empty flatbed. Understanding where your equipment falls in the benchmark range helps you set the right minimum rate.
A loaded 53-foot dry van semi in good mechanical condition on flat interstate typically averages 6.5–7.0 MPG. Empty, the same truck often runs 7.5–8.5 MPG because the aerodynamics are better with a sealed trailer and there's less total weight.
At $3.80/gallon and 6.5 MPG loaded: $0.585/mile in fuel. At 10,000 miles/month: $5,846/month.
Dry van is the most studied equipment type, and these numbers are close to what major carriers report in their quarterly filings. If your fuel CPM is significantly higher than $0.60 at current prices and average MPG, it's worth investigating engine tune, tire pressure, and driving habits.
Reefer trucks carry two fuel costs: tractor fuel and refrigeration unit fuel. The tractor typically sees 5.5–6.5 MPG when loaded (the trailer is heavier and the reefer adds aerodynamic drag). The refrigeration unit burns an additional 0.4–0.8 gallons per hour depending on set temperature, ambient temperature, and unit age.
On a 500-mile loaded run taking 8 hours, add 4–6 gallons of reefer fuel (at $3.80 = $15.20–$22.80) on top of tractor fuel. That's often another $0.03–$0.05/mile in fuel cost that owners running the numbers forget to include.
Annual fuel cost difference between dry van and reefer at 120,000 miles/year: - Dry van at 6.5 MPG and $3.80/gal: $70,154/year - Reefer at 6.0 MPG plus reefer fuel: approximately $82,000–$88,000/year
Flatbed semis typically average 5.5–7.0 MPG depending heavily on cargo weight and terrain. A flatbed hauling steel coils at 45,000 lbs through the Appalachians will see 5.0–5.5 MPG. The same truck running a light lumber load on flat Texas interstate might hit 7.0+.
The wide variance in flatbed MPG is why experienced flatbed operators don't use a fixed fuel cost — they estimate per-load based on cargo weight and route terrain, using a tool like this one with an adjusted MPG for the specific conditions.
Hotshot rigs pulling a gooseneck or bumper-pull trailer with a 3/4-ton or 1-ton pickup typically see 10–14 MPG empty and 8–12 MPG loaded depending on trailer weight. The smaller engine and lighter total weight make hotshot the most fuel-efficient option per truck, but the smaller payload means more loads are needed to cover the same revenue.
At 10 MPG and $3.80/gallon: $0.38/mile in fuel — roughly 35% less than a loaded semi. That fuel efficiency is one of the main economic advantages of hotshot, partially offsetting the lower per-mile rates in the hotshot segment.
Sprinter vans and cargo vans running on diesel typically see 20–28 MPG, making fuel cost per mile around $0.136–$0.190 at $3.80/gallon. Box trucks (16–26 foot) on diesel average 8–14 MPG, or $0.271–$0.475/mile. These rigs operate on shorter routes with more stops, so idle time and urban driving cycles reduce real-world fuel economy below highway estimates.
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