Quick answer
Gas cost per mile is fuel price ÷ MPG. EV energy cost per mile is electricity price ÷ miles per kWh, with charging loss included when appropriate. Using local rates and your actual efficiency makes the comparison much more useful than national averages.
How to work it out
- Enter annual mileage or compare on a per-mile basis.
- Use your gasoline price and realistic MPG.
- Use your electricity price and realistic EV efficiency.
- Include charging losses for home charging.
- Compare energy cost first, then separately consider insurance, depreciation, maintenance and financing.
Example
At $3.50/gal and 30 MPG, gasoline costs about 11.7¢/mile. At $0.15/kWh and 3.5 mi/kWh, electricity is about 4.3¢/mile before charging-loss adjustment.
What can change the answer
Energy cost alone is not total ownership cost. Vehicle price, depreciation, insurance and public fast-charging use can outweigh the fuel difference.
Run the calculation with your numbers
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Open EV vs Gas Cost Calculator