Fuel Budget Planner
Plan your monthly, quarterly, and annual fuel budget based on expected mileage, MPG, and fuel price.
Results
Visualization
How It Works
Fuel is the single largest operating expense for owner-operators and small fleets — ATRI 2024 data puts it at $0.622/mi, or 27.4% of the marginal cost-per-mile total of $2.27. The annual number for a typical 120,000-mi/year owner-operator at 6.5 MPG and $3.79/gal is $69,969 — more than the $63,180 ATRI average for driver compensation. A fuel budget that's off by 10% means a $7K cash-flow surprise. Build the budget around your real fill-to-fill MPG, the EIA Short-Term Energy Outlook diesel forecast for the next 12 months, and a 5-8% volatility cushion. The carriers that survived the 2022 spike from $3.27 to $5.81 (EIA national average) had budgets with cushions; the ones that didn't lost trucks.
The Formula
Variables
- Monthly Miles — Average projected monthly miles (loaded + deadhead)
- MPG — Trailing 13-week fill-to-fill average MPG
- Fuel Price — EIA STEO forecast or 4-week trailing pump average plus 5-8% cushion
Worked Example
Owner-operator running 10,500 miles/month average (recent 6-month log), 6.6 MPG fill-to-fill average, planning Q2 2026 fuel budget. EIA Short-Term Energy Outlook (March 2026 release) projects Q2 retail diesel at $3.82/gal, with a 90% confidence band reaching $4.18 at the upper bound. Base monthly gallons: 10,500 / 6.6 = 1,591. Base monthly fuel cost: 1,591 x $3.82 = $6,077. Quarterly base: $18,232. Add 7% volatility cushion (covers the upper-band scenario): $19,508 quarterly. That's $19,508 you set aside before counting any of it as available for truck payment, insurance, or owner pay. On gross revenue of $25K/month at $2.38/mi, fuel is 24.3% — inside the healthy 20-30% band per ATRI benchmarks.
Practical Tips
- Set aside fuel money weekly into a dedicated account. The weekly amount = monthly budget / 4.33. Fuel cards charge for fuel daily; running it from operating cash mixes the buckets and makes a spike look like an insurance shortfall later.
- Watch the EIA Short-Term Energy Outlook (released second Tuesday each month at eia.gov/outlooks/steo). It posts 12 months forward retail diesel forecast with confidence bands. The Q1 2026 STEO projected $3.79 average for 2026, range $3.55-$4.05. Use the upper bound for budget planning, not the midpoint.
- Diesel typically peaks May-June (driving season) and December-January (heating oil demand pulls distillate). The 2024 EIA data showed an $0.18/gal seasonal swing from October low to June high. Build heavier fuel reserves into your Q2 and Q4 budgets.
- Stack fuel-card discounts: TCS or RTS for the cash discount network, Mudflap for additional discounts at participating independents, and a regional ExxonMobil BusinessLine for refinery-direct pricing in TX/LA. Combined networks usually save $0.30-$0.55/gal vs cash retail without per-fill fees.
- Budget fuel as a percentage of expected gross revenue, not as an absolute number. Healthy band per ATRI 2024: 22-30% of gross. Above 32% sustained means rates are too low or MPG is dropping — both correctable. Below 20% means you're either over-charging customers (good problem) or under-counting deadhead (bad problem).
- Build a per-load fuel-coverage check. Before you accept any load, calculate fuel cost = (loaded mi + DH mi) / MPG x current diesel. If fuel cost exceeds 30% of the gross rate, the load is below water unless the FSC fully covers the spread above your contract base.
Frequently Asked Questions
How much does the average owner-operator actually spend on fuel?
ATRI 2024: $0.622/mi fleetwide on fuel. At 120,000 miles/year that's $74,640/year. Single-truck OO's on long-haul typically run 100K-130K miles, so the band is $62K-$81K annually at 2026 diesel pricing. This is the largest single line item in operating cost — bigger than driver wages for an OO who runs as the driver.
Should I budget for fuel price increases?
Yes. Use the EIA Short-Term Energy Outlook upper-band forecast, not the midpoint. EIA STEO Q1 2026 release projected $3.79 midpoint with $4.05 upper. Budget at $4.05 — if reality lands at $3.79, the variance becomes operating cushion. If reality lands at $4.05 or above, you don't get caught.
Do fuel cards really save enough to matter?
Yes. TCS Fuel Card and RTS Pro Card both negotiate cash discounts at 9,000+ stations averaging $0.30-$0.45/gal vs retail. On 1,500 gallons/month, that's $450-$675/mo or $5,400-$8,100/year. Most cards charge $0-$5/month flat, no per-fill fees. The math is unambiguously positive for any owner-operator running over 100K miles/year.
How many gallons does a semi truck use per month?
At 10,000 miles/month and 6.6 MPG fleet-typical, 1,515 gallons. Heavy-haul or mountain-route operators at 5.8 MPG and 9,500 mi/month run 1,638 gallons. Reefer operations add another 200-300 gallons/month for trailer-unit fuel. The number you should track is YOUR fill-to-fill total — not the industry average.
What percentage of revenue should fuel be?
ATRI 2024 healthy benchmark: 22-30% of gross revenue. Below 22% usually indicates excellent rates or premium freight (heavy haul, hazmat). Above 30% means either rates are too low for the lane or MPG has dropped — investigate before assuming the market is the problem. Sustained above 35% is a profitability emergency.
How do I budget fuel during a price spike?
Three moves in priority order: (1) raise the per-mile rate floor for new loads — most contracts allow renegotiation at 90-day or annual marks, (2) re-route to PADD regions with lower diesel (Gulf Coast/PADD 3 typically runs $0.20-$0.30/gal below New England/PADD 1A), (3) tighten driving discipline — drop cruise to 60, eliminate extended idling, push tire pressure to spec. Combined these recover 8-12% of the spike impact.