Methodology
A decision you can inspect.
Wattfull estimates whether buying a particular EV makes financial sense compared with keeping your current car. The result is only as reliable as its assumptions. Every important unknown should remain visible.
Analyze your EV →- Your exact catalog selection, purchase price, current car, mileage, charging mix and ownership horizon determine the calculation. Check the selected variant against the listing; wheel and configuration differences may not be represented in the catalog.
- Past purchase payments are sunk costs. What matters now is the cost of switching and the future costs of each option, including the values and cost differences you supply.
- Electricity is entered in dollars per kWh, gasoline in dollars per gallon, efficiency in kWh per 100 miles or miles per gallon, and mileage in miles per year.
- The verdict and decision boundaries come from deterministic arithmetic. No AI response supplies the financial result.
- Insurance, resale value, financing, taxes and other unknown costs can change the answer. Read the result's included and excluded assumptions before relying on the verdict.
- A sensitivity scenario changes an assumption to show its effect. It is not a statistical confidence interval or a promise about future costs.
Reference sources
These explain the data families used across Wattfull. Linking a source does not certify that a bundled record is current.
- EPA / FuelEconomy.gov vehicle data and units
- EIA electricity data and gasoline price data
- AAA Your Driving Costs
- IRS clean vehicle credit rules
- NHTSA recall lookup
Optional product links may be affiliate links. Merchant commissions are not inputs to the EV decision calculation.