For the EV, use realistic electricity consumption and the tariff where charging will occur, including a margin for charging losses. For the combustion vehicle, use observed fuel economy and a defensible fuel price. Keep annual distance and ownership years aligned. If finance, taxes, tyres, tolls or parking materially differ, calculate those separately and add them to both scenarios consistently.
Maintenance and insurance vary by model, age, use and provider. Depreciation is usually the largest uncertain component because future demand, incentives, battery warranty, condition, mileage and new-model pricing can move resale values. Run a conservative, central and optimistic case instead of depending on one percentage. Record every assumption so another person can reproduce and challenge the comparison.
Use quotations from insurers and finance providers, current tariffs and recent service information before making a purchase. Confirm battery and vehicle warranty terms for the exact trim. The calculator does not assess personal tax, investment returns, loan eligibility or the mechanical condition of a particular vehicle. A pre-purchase inspection remains important for any used car.
Use the model directory, brand comparisons, practical guides and current marketplace listings as separate evidence sources before making a decision.