📋 Trip Details
Select your preferred units
mi
e.g. 300 miles for a typical road trip
Enter trip distance.
MPG
US average: 25 MPG
Enter fuel efficiency.
$/gal
US avg 2026: ~$3.45/gal
Enter fuel price.
pax
Split cost between passengers (optional, default 1)
📋 Your Driving Habits
mi
Total round-trip commute per day
Enter daily commute distance.
days
Typical working days (usually 20–23)
Enter work days.
mi/mo
Errands, weekends, other driving
Enter other miles.
MPG
Your vehicle’s combined MPG
Enter fuel efficiency.
$/gal
Current local gas price
Enter fuel price.
📋 Your Vehicle’s Fuel Efficiency
MPG
Your vehicle’s MPG
Enter fuel efficiency.
$/gal
Current local price
Enter fuel price.
mi/yr
US average: 13,500 mi/yr (FHWA 2024)
Enter annual miles.
📋 Compare Current vs New Vehicle
MPG
Your current car’s fuel efficiency
Enter current MPG.
MPG
Prospective new car’s MPG
Enter new MPG.
mi/yr
How many miles you drive per year
Enter annual miles.
$/gal
Current local gas price
Enter fuel price.
Trip Fuel Cost
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⚠️ Disclaimer: Fuel cost estimates are based on entered MPG and fuel price. Real-world fuel consumption varies with driving speed, load, terrain, temperature, and vehicle condition. EPA-rated MPG is typically 10 to 20 percent higher than real-world driving. Always carry extra fuel budget for detours and unexpected conditions.
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Sources & Methodology
All fuel cost formulas use standard EPA and DOE calculation methods. Gas price benchmarks from US EIA. Average mileage from FHWA 2024 data. CO2 emissions per gallon from EPA factsheet.
US EIA — Weekly Retail Gasoline Prices 2026
US Energy Information Administration weekly retail gasoline price data providing the national average and regional price benchmarks used as default fuel price suggestions. National average regular unleaded approximately $3.30 to $3.60/gallon in early 2026.
fueleconomy.gov — EPA Fuel Economy Guide 2026
Official EPA fuel economy ratings for all 2026 vehicles used for MPG benchmarks. Average new car MPG approximately 28.2 combined per EPA 2025 model year data. The standard MPG reference and vehicle class averages in the content tables are sourced from this database.
FHWA — Annual Miles Driven per Driver 2024
Federal Highway Administration data: average US driver covers approximately 13,500 miles per year. Used as the default annual mileage assumption in monthly budget and cost-per-mile calculations.
Methodology:
Trip fuel (gal) = Distance (mi) / MPG
Trip cost ($) = Trip fuel (gal) x Price per gallon
Cost per mile = Price per gallon / MPG
Monthly fuel cost = (Monthly miles / MPG) x Price per gallon
Annual savings = Annual miles x (1/Old MPG - 1/New MPG) x Price per gallon
CO2 per trip (kg) = Gallons used x 8.89 kg CO2/gallon (EPA value for regular gasoline)
Metric formula: Fuel (liters) = Distance (km) x L/100km / 100. Cost = Fuel (liters) x Price per liter. The EPA-published CO2 emission factor for regular gasoline is 8.887 kg per gallon burned.
Last reviewed: April 2026
Fuel Cost Calculator Guide — How Much Does Gas Actually Cost You?
Fuel is one of the top 3 monthly expenses for most American households — yet most drivers have no precise idea what they actually spend. The average American drives 13,500 miles per year (FHWA 2024) in a vehicle averaging 25 MPG, spending approximately $1,863 per year on gas at $3.45/gallon. But that average hides enormous variation: a driver with a 15 MPG truck driving 18,000 miles per year spends $4,140 annually, while someone with a 40 MPG hybrid doing 10,000 miles spends only $862.
Trip Cost = (Distance / MPG) x Price per gallon
Example — LA to Vegas road trip (270 miles), 28 MPG, $3.45/gal:
Fuel needed = 270 / 28 = 9.64 gallons
Trip cost = 9.64 x $3.45 = $33.27 one-way | $66.54 round trip
Split between 3 passengers: $33.27 / 3 = $11.09 each one-way
Metric example — 500 km trip, 8.5 L/100km, $1.60/L:
Fuel = (500/100) x 8.5 = 42.5 liters | Cost = 42.5 x $1.60 = $68.00
Fuel needed = 270 / 28 = 9.64 gallons
Trip cost = 9.64 x $3.45 = $33.27 one-way | $66.54 round trip
Split between 3 passengers: $33.27 / 3 = $11.09 each one-way
Metric example — 500 km trip, 8.5 L/100km, $1.60/L:
Fuel = (500/100) x 8.5 = 42.5 liters | Cost = 42.5 x $1.60 = $68.00
Average Fuel Economy by Vehicle Type — 2026 Reference
| Vehicle Type | City MPG | Highway MPG | Combined MPG | Annual Fuel Cost* |
|---|---|---|---|---|
| Compact hybrid | 50 | 47 | 49 | $949/yr |
| Compact sedan | 32 | 41 | 35 | $1,329/yr |
| Midsize sedan | 28 | 36 | 31 | $1,501/yr |
| Compact SUV / CUV | 25 | 32 | 28 | $1,661/yr |
| Midsize SUV | 20 | 27 | 23 | $2,023/yr |
| Pickup truck (midsize) | 18 | 24 | 20 | $2,326/yr |
| Full-size pickup (V8) | 14 | 19 | 16 | $2,907/yr |
| Minivan | 18 | 24 | 21 | $2,214/yr |
*Annual fuel cost based on 13,500 mi/yr at $3.45/gallon national average 2026
How Much Does Gas Cost Per Mile? — By MPG and Price
Your fuel cost per mile = gas price ÷ MPG. This simple ratio shows how much every mile you drive costs in fuel alone. At $3.45/gallon, a 15 MPG truck costs $0.23 per mile in fuel. A 40 MPG hybrid costs just $0.086 per mile. The IRS mileage reimbursement rate of $0.67 per mile (2025) covers all vehicle costs — and fuel typically represents about 15 to 30 percent of that total depending on efficiency.
| Gas Price | 20 MPG | 25 MPG | 30 MPG | 35 MPG | 40 MPG |
|---|---|---|---|---|---|
| $2.50/gal | $0.125/mi | $0.100/mi | $0.083/mi | $0.071/mi | $0.063/mi |
| $3.00/gal | $0.150/mi | $0.120/mi | $0.100/mi | $0.086/mi | $0.075/mi |
| $3.45/gal | $0.173/mi | $0.138/mi | $0.115/mi | $0.099/mi | $0.086/mi |
| $4.00/gal | $0.200/mi | $0.160/mi | $0.133/mi | $0.114/mi | $0.100/mi |
| $4.50/gal | $0.225/mi | $0.180/mi | $0.150/mi | $0.129/mi | $0.113/mi |
How Much Money Can You Save With a More Efficient Car?
The annual fuel savings formula: Savings = Annual miles × (1/Old MPG − 1/New MPG) × Price per gallon. The efficiency improvement curve is non-linear — the biggest savings come from improving low-MPG vehicles. Going from 15 MPG to 20 MPG saves more than going from 30 MPG to 40 MPG, even though both represent a 33% improvement in efficiency. This is the MPG illusion — small MPG numbers matter more than large ones in dollar terms.
| Upgrade From → To | Gal Saved/Yr* | Annual Savings* | 5-Year Savings |
|---|---|---|---|
| 15 MPG → 20 MPG | 225 gal | $776/yr | $3,881 |
| 20 MPG → 25 MPG | 135 gal | $466/yr | $2,329 |
| 20 MPG → 35 MPG | 321 gal | $1,109/yr | $5,544 |
| 25 MPG → 40 MPG | 225 gal | $776/yr | $3,881 |
| 25 MPG → 50 MPG (hybrid) | 270 gal | $932/yr | $4,658 |
*Based on 15,000 mi/yr at $3.45/gallon
💡 10 proven ways to reduce fuel costs: Drive at 55–65 mph on highways (each 10 mph over 50 mph costs about $0.36 more per gallon equivalent). Avoid aggressive acceleration and braking (up to 30% savings). Keep tires properly inflated (+1 PSI = +0.2% MPG). Remove roof racks when not in use (2–8% highway savings). Avoid short cold-engine trips under 5 miles. Use cruise control on highways. Park in shade to reduce AC load. Avoid unnecessary idling (0 MPG). Use recommended motor oil grade. Plan errands to minimize backtracking.
Frequently Asked Questions
Formula: Trip fuel cost = (Distance / MPG) x Price per gallon. Example: 300-mile trip in a 28 MPG car at $3.45/gallon: Gallons needed = 300/28 = 10.71 gallons. Cost = 10.71 x $3.45 = $36.96. For metric: Cost = (Distance km / 100) x L/100km x Price per liter. Enter your values into Mode 1 (Trip Cost) above for instant calculation with passenger split and CO2 estimate.
Cost per mile = Price per gallon / MPG. At $3.45/gallon: 20 MPG = $0.173/mi, 28 MPG = $0.123/mi, 35 MPG = $0.099/mi, 40 MPG = $0.086/mi. The IRS 2025 mileage rate ($0.67/mi) covers fuel plus depreciation, maintenance, and insurance — fuel typically represents 15-25% of total per-mile cost. Use Mode 3 (Cost Per Mile) to calculate your specific vehicle's fuel cost per mile and annual fuel spend.
Gallons needed = Trip distance / MPG. LA to New York (~2,800 miles) in a 28 MPG car = 100 gallons = $345 one-way at $3.45/gallon. Round trip = 200 gallons = $690. Add 10% buffer for detours. Highway driving above 70 mph reduces effective MPG by 10-20% vs EPA estimate. Use Mode 1 with your actual distance and MPG for a precise estimate. Divide by passengers for per-person cost.
Monthly fuel cost = (Monthly miles / MPG) x Price per gallon. Average American: 1,125 miles/month, 25 MPG, $3.45/gallon = $155/month. A commuter driving 60 miles/day x 22 days = 1,320 commute miles + 400 other miles = 1,720 total miles/month. At 28 MPG, $3.45/gal: $211/month. Use Mode 2 (Monthly Budget) above to enter your specific commute and driving habits.
The US national average for regular unleaded gasoline is approximately $3.30 to $3.60 per gallon in early 2026, per EIA data. Regional variation is significant: California averages $4.50 to $5.50+, Gulf Coast states $2.90 to $3.20. Check GasBuddy or the EIA website for current local prices. The calculator uses $3.45 as a default national average but you should enter your actual local price for accurate results.
Formula: Annual savings = Annual miles x (1/Old MPG - 1/New MPG) x Price per gallon. Example: 15,000 miles/yr, switching from 20 to 35 MPG at $3.45/gal: Old cost = (15,000/20) x $3.45 = $2,588. New cost = (15,000/35) x $3.45 = $1,479. Annual savings = $1,109. Over 5 years: $5,544. Use Mode 4 (Fuel Savings) above to calculate your specific savings. The biggest gains come from low MPG vehicles — going from 15 to 20 MPG saves more per year than going from 30 to 40 MPG.
Yes. Most vehicles achieve peak efficiency between 45 and 65 mph. At 75 mph, fuel consumption increases approximately 20% vs 55 mph due to aerodynamic drag (which increases with the square of speed). At 85 mph, fuel consumption is about 40% higher. DOE estimates each 5 mph above 50 mph costs about $0.18 to $0.22 extra per gallon equivalent. On a 300-mile highway trip, driving 65 mph instead of 75 mph saves approximately $5 to $10 in fuel.
For 1-2 passengers, flying is often cheaper for trips over 500-700 miles. For 3-4 passengers, driving is almost always cheaper because the fuel cost is shared. Example: 500-mile trip. Driving at 28 MPG: 17.9 gallons x $3.45 = $61.67 total, or $15.42/person for 4 people. Flying: $100-$200+ per person. For solo travelers on 300+ mile trips, compare total costs including airport transportation, parking, and time value.
Metric formula: Fuel used (liters) = Distance (km) / 100 x L/100km. Fuel cost = Fuel used x Price per liter. Example: 500 km trip, 8.5 L/100km, $1.60/liter: Fuel = 500/100 x 8.5 = 42.5 L. Cost = 42.5 x $1.60 = $68. Select "Metric — km & liters" in Mode 1 (Trip Cost) and enter consumption as L/100km for automatic calculation. To convert MPG to L/100km: L/100km = 235.21 / MPG.
New cars sold in model year 2025 average approximately 28.2 MPG combined (EPA estimate). The average of all vehicles currently on US roads is about 25 MPG due to the mix of older vehicles in the fleet. Hybrids: 40-55 MPG. Compact sedans: 30-40 MPG highway. Pickup trucks: 16-22 MPG combined. Large SUVs: 16-22 MPG. Check fueleconomy.gov for your specific vehicle's EPA rating.
A gallon of regular gasoline produces 8.89 kg of CO2 when burned (EPA). CO2 per trip = (Distance / MPG) x 8.89 kg. Example: 300-mile trip at 28 MPG: 300/28 = 10.71 gallons x 8.89 = 95.2 kg CO2 (210 lbs). The average American car emits about 4.6 metric tons of CO2 per year. The Trip Cost mode (Mode 1) shows your CO2 output alongside the fuel cost.
Key real-world MPG reducers: Highway speed above 70 mph (10-20% reduction). Aggressive acceleration/braking (10-40%). Cold weather below 20°F (10-20%). Air conditioning in hot weather (5-25%). Low tire pressure — 8 PSI low reduces MPG about 1.6%. Roof rack or cargo box at highway speeds (2-8%). Short trips under 5 miles — cold engine uses significantly more fuel. Towing. Real-world MPG is typically 10-20% lower than EPA rated MPG.
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