Last updated: October 16, 2026
Overview
This page explains how CarCostWise builds the cost figures in our articles and calculators.
Sources
We rely on public, citable data and name the source next to the figures we use. Typical sources include:
- AAA, Your Driving Costs, for ownership cost benchmarks.
- US Bureau of Labor Statistics (BLS) Consumer Price Index for vehicle, repair and insurance price trends.
- US Energy Information Administration (EIA) for gasoline, diesel and electricity prices.
- National Highway Traffic Safety Administration (NHTSA) for recalls, safety and fuel economy data.
- State DMV and tax agency websites for registration fees, title fees and taxes.
- Insurance Institute for Highway Safety (IIHS) and National Association of Insurance Commissioners (NAIC) for insurance data.
- Manufacturer maintenance schedules for service intervals.
- Published repair cost ranges from repair-pricing sites. We cite these ranges and never copy them.
Low, average and high ranges
Where the data allows, we show a low, average and high figure instead of one number. The range reflects differences between vehicles, shops, insurers and driving habits.
Regional variance
Fuel prices, labor rates, taxes, fees and insurance premiums differ by state and city. We note when a figure is a national average and, where possible, show state-level differences.
Update schedule
We review time-sensitive figures, such as fuel, insurance and repair costs, every quarter. Each page shows the date it was last updated.
Calculator assumptions
Each calculator lists its assumptions, such as annual mileage, ownership length, fuel price and financing terms. You can change these inputs. Results are estimates, not quotes.
Corrections
If you find an error or a better source, contact us. We review reports promptly and correct verified errors, noting the change on the page. See our editorial policy.