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Which car-cost model should you use?

Which car-cost model should you use. Check the cause, evidence to keep, exact recovery steps, and escalation. Based on Electric Car Total Cost vs Petrol.

Start here

Pick the one path that matches your charging reality.

What applies to this exact problem

Pick the one path that matches your charging reality.

Path A — Reliable home charging

Model most charging at your actual residential tariff, then add a smaller public-fast-charging share. Include charger installation and any electrical-upgrade cost.

Path B — Mixed home and public charging

Use a weighted electricity price: home kWh × home share plus public kWh × public share. Stress-test the result if the public-charging share grows.

Path C — Mostly public charging

Use your real nearby network prices and detour/time costs. Do not use a low home tariff if you cannot realistically charge at home.

Path D — Incentive-dependent purchase

Run two cases: incentive received and incentive not received or delayed. A purchase should not look affordable only because an unapproved subsidy was assumed.

Check these first

  • Start from the agreement, KFS/sanction terms, statement, or official tariff rather than an advertised headline rate.
  • Rebuild the calculation from principal, dates, rate type, tenure, fees, taxes, insurance, and prepayment assumptions.
  • Compare your result with the lender or issuer figure and isolate the first line where the numbers diverge.

Fix it in this order

  1. Start from the agreement, KFS/sanction terms, statement, or official tariff rather than an advertised headline rate.
  2. Rebuild the calculation from principal, dates, rate type, tenure, fees, taxes, insurance, and prepayment assumptions.
  3. Capture vehicle model, VIN, battery/charger serial where available, odometer, warning codes, and the exact symptom.
  4. Ask the authorised service centre for diagnostic findings and the warranty clause used for approval or denial.
  5. Separate normal range variation from a measurable fault using repeatable conditions, charging logs, error codes, or state-of-health evidence.
  6. Keep invoices, job cards, firmware/service history, and photographs of warnings or damage.
  7. For subsidy/incentive issues, verify model eligibility, invoice treatment, registration details, and portal status independently.

Build the proof pack

  • Purchase invoice and warranty
  • Job cards/diagnostic report
  • Charging/range/error evidence
  • Subsidy or portal application record where relevant

Avoid making the case harder

  • Opening or repairing high-voltage components yourself
  • Accepting a warranty denial without the clause/reason
  • Assuming brochure range is guaranteed in every condition

How you know it is really fixed

  • You can reproduce the charged or projected amount from documented inputs.
  • Any unexplained difference has a written explanation or correction.

If it is still not fixed

  1. Manufacturer/dealer grievance
  2. Scheme/portal helpdesk when incentive-related
  3. Consumer remedy for unresolved product/service disputes

Official sources from the full guide

Need the complete context?

This page solves one branch. The parent guide covers the full decision, edge cases, alternatives, and related checks.

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