EV Fuel Savings Calculator
Estimate how much you'd save per year on fuel and electricity by switching from a gas car to an EV. Enter your annual miles, local gas price, and electricity rate. Defaults are US averages — edit them for an accurate result.
Estimated annual fuel savings
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Sensitivity: What if gas prices change?
Fuel savings depend heavily on gas prices. This table shows your estimated annual savings if gasoline costs $1 less or $1 more per gallon.
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Excludes maintenance, insurance, depreciation, and purchase price. All results are calculated estimates based on your inputs and the defaults shown — not official EIA, EPA, or manufacturer figures.
How this was calculated
- Annual gas cost = (annual miles ÷ MPG) × gas price.
- Blended EV rate = (home share × home rate) + (public share × public rate), where home share = 1 − public share.
- Annual EV electricity cost = (annual miles ÷ EV efficiency in mi/kWh) × blended rate.
- Annual fuel savings = annual gas cost − annual EV electricity cost.
- Monthly savings = annual savings ÷ 12.
- Cost per mile = gas price ÷ MPG (gas) and blended rate ÷ EV efficiency (EV).
Worked example
12,000 miles/year · 30 MPG · $3.50/gal · 3.5 mi/kWh · $0.16/kWh home · 20% public at $0.40/kWh:
- Annual gas cost: (12,000 ÷ 30) × $3.50 = $1,400
- Blended rate: (0.8 × $0.16) + (0.2 × $0.40) = $0.208/kWh
- Annual EV cost: (12,000 ÷ 3.5) × $0.208 ≈ $713
- Annual savings ≈ $687 (about $57/month)
Key assumptions & sources
- Default annual miles: ~10,787 mi/year — FHWA US average. Verify current figure before relying on it.
- Default gas MPG and EV efficiency: EPA combined ratings for a mid-size car and a typical EV. Check fueleconomy.gov for your exact model.
- Default electricity and gas price: US average estimates (EIA/AAA). Enter your local rates for accuracy.
- Public charging rate: Estimate — varies widely by network. Charging losses (~10%) are not applied to keep the formula transparent.
- Excludes: maintenance, insurance, depreciation, purchase price, state/local EV incentives, and time-of-use rate structures.
Frequently asked questions
What does this calculator include?
It compares fuel and electricity costs only — the annual cost of gasoline in your current car versus the annual cost of electricity to drive the same miles in an EV. It does not include maintenance, insurance, depreciation, purchase price, or tax incentives.
How is the annual gas cost calculated?
Annual gas cost = (annual miles ÷ your gas vehicle's MPG) × your local gas price per gallon. A car getting 30 MPG driven 12,000 miles at $3.50/gal costs $1,400 per year in fuel.
What is the blended EV rate?
Most EV owners charge at home for most miles and use public fast chargers occasionally. The blended rate is a weighted average of your home electricity rate and your public charging rate, based on the percentage of miles you drive on each.
Why might my result differ from another calculator?
Results depend entirely on inputs: annual miles, gas price, electricity rate, EV efficiency, and public charging mix all change the answer. Different tools use different defaults and formulas. Always enter your own numbers for a meaningful estimate.
Should charging losses be included?
Real-world charging involves ~10% losses (energy drawn from the grid exceeds energy stored in the battery). This calculator does not apply that multiplier to keep the formula transparent. You can approximate it by slightly reducing your entered EV efficiency.
What happens if gas prices drop?
The sensitivity table shows your estimated savings if gas prices are $1 higher or lower than the price you entered. Savings shrink when gas is cheaper and grow when gas is more expensive. Electricity rates affect the EV cost but not the gas cost.
What is the biggest factor in my savings?
Annual miles driven and the gap between your local gas price and your effective electricity rate. Drivers with high annual mileage, expensive gasoline, or low home electricity rates typically see the largest fuel savings.
EV Fuel Savings Calculator
This calculator estimates how much you'd save per year on fuel and electricity by switching from a gas car to an EV. Enter your miles, gas price, and electricity rate — we use EIA, EPA, and FHWA data to calculate the result.
Use the interactive calculator above to get your personalized number, then read below to understand how the calculation works, what factors drive your savings, and what the result does not include.
How This Calculator Works
The calculator compares two annual costs: what you spend on gasoline in your current vehicle, and what you would spend on electricity to drive the same miles in an EV. The difference is your estimated annual fuel savings.
The Formula
- Annual gas cost = (annual miles ÷ gas MPG) × gas price per gallon
- Blended EV electricity rate = (home charging share × home rate) + (public charging share × public rate)
- Annual EV electricity cost = (annual miles ÷ EV efficiency in mi/kWh) × blended rate
- Annual fuel savings = annual gas cost − annual EV electricity cost
- Monthly savings = annual savings ÷ 12
Worked Example
Assume 12,000 miles per year, a 30 MPG gas car, gasoline at $3.50 per gallon, an EV that achieves 3.5 mi/kWh, home electricity at $0.16/kWh, and 20% public charging at $0.40/kWh:
- Annual gas cost: (12,000 ÷ 30) × $3.50 = $1,400
- Blended EV rate: (0.8 × $0.16) + (0.2 × $0.40) = $0.208/kWh
- Annual EV cost: (12,000 ÷ 3.5) × $0.208 ≈ $713
- Annual savings ≈ $687 (about $57 per month)
These figures use the verified formulas above with illustrative inputs. Your actual result depends on the inputs you enter and your local electricity and gas prices.
What Affects Your Fuel Savings
Six variables drive the result. Changing any one of them can materially change your savings:
- Annual miles driven. More miles means larger savings — the per-mile cost gap is multiplied across your total driving.
- Your gas vehicle's MPG. A less efficient gas car creates a bigger cost gap against the EV.
- Gasoline price. Higher gas prices increase savings. Prices vary widely by state, season, and week.
- EV efficiency (mi/kWh). More efficient EVs use less electricity per mile, lowering EV cost per mile.
- Home electricity rate. Your utility rate is usually the largest single factor in EV cost. Rates vary by state and utility territory.
- Public charging share and rate. Public fast charging typically costs more than home charging, so the share of miles you charge publicly directly affects the result.
What This Calculator Does Not Include
This page answers one specific question: annual fuel and electricity savings. It does not calculate or include:
- Maintenance costs (EVs typically require less routine service, but tire wear and repairs still apply)
- Insurance premiums (EV insurance can be higher or lower depending on model and provider)
- Depreciation and resale value
- Vehicle purchase price, financing, or lease payments
- Federal or state EV tax credits and incentives (rules and eligibility change — check current IRS and state guidance)
- Home charging equipment and installation costs (Level 2 charger hardware plus circuit work)
- Registration fees or state EV-specific fees
For a broader picture, use the EV Total Cost of Ownership Calculator.
Sensitivity: What If Gas Prices Change?
Fuel savings depend heavily on gas prices, which are volatile. The sensitivity table in the calculator above shows your estimated annual savings if gasoline costs $1 less or $1 more per gallon than the price you entered.
This matters because a result that only works at today's gas price may not hold if prices fall. If your savings remain positive across the full sensitivity range, the conclusion is more robust. If savings turn negative when gas is $1 cheaper, your EV economics depend on sustained higher gas prices — a useful check before committing to a purchase.
Key Assumptions and Sources
Calculations use the formulas above. Defaults use the following sources and are fully editable:
- Annual miles default: approximately 10,787 miles per year — Federal Highway Administration (FHWA) US average. Enter your own odometer history for greater accuracy.
- Gas MPG and EV efficiency defaults: EPA combined ratings from fueleconomy.gov. Defaults approximate a mid-size gas car and a typical EV; check your exact model.
- Electricity price default: approximately $0.16/kWh — US average from the U.S. Energy Information Administration (EIA). Your utility bill rate is the accurate figure.
- Gas price default: approximately $3.50/gallon — US average estimate. Enter your local pump price for accuracy.
- Public charging rate: $0.40/kWh is an estimate. No single authoritative national source exists because rates vary by network, location, and time. Treat as a user input.
- Charging losses: Real-world charging involves roughly 10% losses (energy drawn from the grid exceeds energy stored in the battery). This calculator does not apply that multiplier, to keep the formula transparent. You can approximate it by reducing your entered EV efficiency by about 10%.
Methodology version: 1.0. Update schedule: electricity rate defaults reviewed quarterly; gas price defaults reviewed monthly; vehicle efficiency defaults reviewed annually; federal and state incentive references monitored for changes. Source dates are confirmed at each scheduled review.
Frequently Asked Questions
How much can I save on fuel by switching to an EV?
It depends on your annual miles, your gas car's MPG, your local gas price, your home electricity rate, and how much you charge publicly. A driver covering 12,000 miles a year in a 30 MPG car at $3.50/gallon, charging mostly at home at $0.16/kWh, might save roughly $600–$800 per year on fuel and electricity alone. Higher mileage, higher gas prices, and lower home electricity rates increase savings; lower mileage or cheap gas reduces them.
Does home charging cost less than public charging?
Usually, yes. Home electricity typically costs less per kWh than public DC fast charging, and home charging avoids the network markup and demand charges built into public pricing. Public charging is often used on road trips or when home charging is not available; its share of your total miles directly affects your savings.
Is EV vs gas savings mostly about electricity price?
Electricity price is a major factor, but not the only one. Your gas car's MPG and the local gas price are equally important — a gas guzzler at high gas prices can generate large savings even at moderate electricity rates. Annual miles also scale everything. The calculator lets you test each variable individually.
How do I convert MPG to cost per mile?
Cost per mile for gas = gas price per gallon ÷ MPG. For example, $3.50 per gallon ÷ 30 MPG = $0.117 per mile. For an EV, cost per mile = electricity rate ÷ EV efficiency in mi/kWh. At $0.16/kWh and 3.5 mi/kWh, that is about $0.046 per mile. The calculator shows both figures side by side.
Should I include charging losses?
Real-world charging involves roughly 10% losses — the energy drawn from the grid exceeds the energy stored in the battery. This calculator does not apply that multiplier so the formula stays transparent. To approximate it, reduce your entered EV efficiency by about 10% (for example, 3.5 mi/kWh becomes approximately 3.15 mi/kWh).
What annual mileage should I use?
Use your own odometer history if you have it. The FHWA US average is around 10,787 miles per year, which is a reasonable starting default. If you drive significantly more or less, entering your actual number gives a more accurate result.
What if gas prices drop?
Your savings shrink. The sensitivity table shows your estimated savings at $1 less and $1 more per gallon than your entered price. If your savings turn negative at a lower gas price, your EV economics depend on sustained gas prices — a useful robustness check before committing to a purchase.
Why might my result differ from another calculator?
Different tools use different defaults, different formulas, and different scope. Some include maintenance or tax credits; some use national averages instead of your local rates; some apply charging losses and some do not. Always enter your own numbers — miles, gas price, electricity rate, EV efficiency — for a meaningful comparison.
Related Tools
- EV Ownership Cost Calculator — includes maintenance, insurance, depreciation, and incentives alongside fuel savings.
- EV Cost Per Mile Calculator — estimate your real home-charging cost and compare gas vs electric cost per mile.
- EV Battery Aging Calculator — estimate degradation, range loss, and battery lifespan based on charging habits and climate.
- EV Range Calculator by Temperature — see how cold and hot weather affect your electric car's real-world mileage.
All results are calculated estimates based on user inputs and cited sources. They are not official EIA, EPA, or manufacturer figures, and they exclude costs noted above. Verify current tax credit rules and local utility rates before making a purchase decision.
Official Data Sources
- U.S. Energy Information Administration (EIA) — Electric Power Monthly — Monthly residential electricity prices by state; the source for the calculator's home charging rate default.
- EIA — Weekly Retail Gasoline and Diesel Prices — Weekly U.S. regional gasoline prices; the source for the calculator's gas price default.
- FuelEconomy.gov (U.S. Department of Energy & EPA) — Official EPA combined MPG and kWh/100 mi ratings for every vehicle model year; used for gas MPG and EV efficiency defaults.
- Federal Highway Administration (FHWA) — Average Annual Miles per Driver — Official U.S. average annual mileage data; the source for the calculator's annual miles default.
- IRS — Clean Vehicle Credits (Sections 30D and 25E) — Official federal tax credit rules, eligibility, and dealer reporting requirements; referenced for the article's tax credit context. Note: credit rules changed after September 30, 2025 — always verify current IRS guidance before making purchase decisions.