Fuel Cost Calculator
Calculate and compare annual fuel costs for different vehicles based on their fuel efficiency (MPG), gas prices, and how much you drive. Also compare against electric vehicle costs to see total potential savings.
Fuel is one of the biggest variable costs of car ownership. For the average U.S. driver covering 13,500 miles per year, fuel costs run anywhere from $500 (efficient compact) to $4,000+ (large pickup truck or SUV). Switching vehicles or fuel types — gas to hybrid to EV — can swing the annual cost by thousands.
This calculator compares the annual fuel cost for two gas vehicles based on their MPG, plus an electric vehicle alternative based on miles-per-kWh and your electricity rate. Use it to project savings from buying a more efficient car, switching to an EV, or simply changing your driving habits.
For most U.S. drivers, the breakeven point between gas and EV operating costs is well below current price points. EVs typically cost $0.03–0.05 per mile vs $0.10–0.15 for gas cars. Over 10 years and 130K miles, that's $8,000–$13,000 in fuel savings — sometimes enough to justify EV price premiums.
Inputs
Results
Current Annual Fuel Cost
$1,680
Compare Vehicle Cost
$1,200
Annual Savings
$480
5-Year Savings
$2,400
Annual Fuel Cost Comparison
Cost Per Mile
Formula
How to use this calculator
- Enter your annual miles. U.S. average is about 13,500 per driver. Total household: ~20–25K for two-driver households.
- Enter your current vehicle's real-world MPG (not EPA sticker — use the MPG calculator if you don't track it).
- Enter the MPG of a vehicle you're considering, or another household vehicle for comparison.
- Enter current gas price for your area (gasbuddy.com or current pump price).
- Enter your electricity rate (look at your utility bill — kWh × rate ÷ kWh used should match your bill).
- Enter EV efficiency for the model you're considering (Tesla Model 3 ~3.8 mi/kWh, F-150 Lightning ~2.0, Toyota RAV4 Prime ~3.5 in EV mode).
- Review annual costs and switching savings.
Worked examples
SUV to compact swap
Trade a 18 MPG SUV for a 38 MPG compact, 12,000 mi/yr at $3.50/gas. SUV: $2,333/yr Compact: $1,105/yr Savings: $1,228/yr → $12,280 over 10 years. Over the typical 7–10 year ownership period of a new car, fuel savings alone can offset a substantial portion of the purchase price difference.
Gas to EV
Current 28 MPG sedan, 12,000 mi/yr at $3.50/gas. EV at 3.5 mi/kWh, $0.13/kWh. Gas: $1,500/yr EV: $446/yr Savings: $1,054/yr → $10,540 over 10 years. Plus EVs typically need less maintenance (no oil changes, fewer brake replacements due to regen). Total operating-cost savings often exceed $15K over 10 years.
When to use this calculator
Use this calculator when: - Shopping for a new vehicle and comparing fuel cost across options - Deciding whether to switch from gas to hybrid or EV - Budgeting transportation costs as part of a larger financial review - Justifying a more efficient vehicle to a skeptical partner (numbers are convincing)
Things this calculator doesn't include: - Maintenance costs (EVs have much lower maintenance) - Insurance differences (sometimes higher for EVs, lower for older economy cars) - Tax credits (Federal EV credit and state incentives can offset $7,500+ on new EV purchases) - Public charging cost (typically $0.20–0.50/kWh vs $0.13 at home) - Time-of-use electricity rates (some utilities offer EV-charging discounts at night)
For a fuller cost-of-ownership comparison, also use the auto-loan calculator (purchase price impact) and the car depreciation calculator.
Common mistakes to avoid
- Using EPA MPG ratings without adjustment. Real-world MPG is typically 10–20% lower than EPA combined.
- Comparing average gas prices vs your local prices. Coastal metros (CA, WA, NY) often pay $1+/gal more than the Midwest average.
- Ignoring electricity rate variance. EV operating cost in California ($0.40/kWh) is very different from Idaho ($0.10/kWh).
- Forgetting maintenance savings on EVs. Gas cars need oil changes, tune-ups, exhaust work that EVs don't.
- Not comparing total cost of ownership. Fuel is just one component; purchase price, depreciation, insurance, and maintenance all matter.
- Using winter fuel/electricity only. Cold weather cuts both gas MPG and EV range by 10–25%; use annual averages.
Frequently Asked Questions
Sources & further reading
- Fuel Economy guide — U.S. Department of Energy & EPA
- Average annual miles driven — U.S. Federal Highway Administration