EV vs. gas costs: compare the full monthly bill

Separate the car payment from the cost of driving

The monthly payment is only one line in your car budget. Comparing a gas lease with an electric lease means combining the contract cost with the way you will use the car. Keep the two calculations separate at first: normalize the lease, then estimate energy, insurance, service and any setup expense.

This guide measures cash spent over a lease period. It is not a lifetime ownership model, an investment comparison or a forecast of resale value. That boundary matters: a charger you install may remain useful after one lease, while a return fee may occur only if you return the car.

Turn each quote into an effective monthly cost

Add the scheduled lease payments and upfront amounts, subtract a first payment already counted in both places, and divide by the term. Then include any separately payable mandatory fees once. Keep refundable deposits separate from expenses: they affect cash tied up but are not automatically a permanent cost.

For example, assume 36 payments of $750 and $4,500 due at signing including the first $750 payment. The scheduled total is 35 × $750 + $4,500 = $30,750, or $854.17 per month. Do not add 36 payments to that drive-off; doing so counts the first payment twice. All figures here are illustrative, not current offers.

Calculate electricity and gasoline consistently

Use the same monthly distance for both cars. For an EV, multiply miles divided by 100 by kWh per 100 miles and your electricity price. For gas, divide miles by mpg and multiply by price per gallon. DOE describes the electricity calculation in its home-charging guidance.

Source: DOE: calculating charging costs

Account for where the energy comes from

The example assumes electricity measured at the wall, including charging losses. If you use a different efficiency measurement, check what it includes before adding a separate loss estimate. These prices were chosen to demonstrate the calculation; they are not a survey of California utilities or charging networks.

With half the energy bought at each example charging rate, electricity costs $157.50 a month. That is $42.50 less than the gas example. With all charging at the higher rate, electricity costs $10 more. Add session, parking, subscription and idle fees that apply to your actual stops. Those charges belong in the budget even if the per-kWh price looks attractive.

Build the rest of the monthly budget

Request insurance quotes for the exact models and drivers rather than assigning a generic electric-car surcharge or discount. Ask for the maintenance schedule and what the lease or manufacturer includes. Tires, damage and optional protection products should have their own lines so you can see what you are choosing.

For home charging, get an installed quote before signing. In a lease-period cash comparison, $1,800 of equipment and installation adds $50 a month over 36 months. That allocation does not claim the equipment becomes worthless at month 36; it simply makes the initial outlay visible. If you already have suitable equipment, use your actual incremental cost instead.

Run a complete worked example

Suppose both cars have an $850 effective lease cost and $200 monthly insurance. Give the EV $30 for service and tires plus $50 of charger setup allocation, and the gas car $45 for service and tires. Using the energy examples above, the EV totals $1,235 with home charging, $1,340 with public charging, and the gas car totals $1,295.

These invented budgets show why the same vehicle can look economical for one household and less so for another. The public-charging scenario omits a home installation, so remove the $50 setup allocation in that scenario: its adjusted total is $1,290. A fair comparison changes related assumptions together, not only the electricity rate. Your actual quotes may produce a completely different result.

Stress-test the assumptions that can change

A useful budget includes a base case and a more demanding case. Increase monthly mileage, change the charging mix and use an actual insurance renewal quote if available. Keep the lease term fixed so you can see which variable changes the result. You do not need a complicated forecast; you need to know whether a modest change would make the car uncomfortable to afford.

For example, increasing the example distance from 1,000 to 1,250 miles raises every energy estimate by 25% when the other inputs stay fixed. The $105 home-energy example becomes $131.25. The $200 gasoline example becomes $250. That does not mean the whole transportation budget rises by 25%, because the lease and other fixed lines do not scale the same way.

Write the source of each input beside the number: a dated vehicle quote, your utility plan, a network’s posted price or a personal insurance quote. Keep a separate list of excluded costs. A comparison that says what it assumes and leaves out is more useful than a precise-looking total whose inputs nobody can reproduce. Revisit the sensitive inputs before you sign.

Use the result to ask a better question

Once you have comparable totals, ask what the difference buys you: convenience, comfort, flexibility or a car you prefer. A $40 monthly difference over 36 months is $1,440; decide whether the trade-off is worthwhile rather than turning a small gap into a universal verdict.

Bring itemized quotes and your charging plan when requesting a comparison. Treat conditional rebates as conditional until eligibility and application to the contract are confirmed. Keep tax benefits outside the base budget unless they have been verified for your situation.