Privacy Policy

Last updated: 27 April 2026

Privacy-first by design. MPG Calc is a free, ad-supported service. We collect only what is strictly necessary to provide the site. Advertising helps keep the service free. For the conditions of use and disclaimers, see our Terms of Service.

What we collect

When you create an account, MPG Calc stores:

  • A bcrypt hash of your passphrase (the raw passphrase is never stored)
  • A one-way lookup hash used to identify your account at login
  • Your recovery email address — optional, only if you choose to add one
  • Your vehicles (name, fuel type, optional number plate)
  • Your fuel records (date, miles, litres, cost, calculated MPG)
  • A last active timestamp updated when you log in or add a record

We do not collect your name, address, payment details or any other personal information. The calculators on the site work entirely without an account and store nothing.

Why we collect it

The data above is strictly necessary to provide the fuel economy tracking service. The lawful basis under UK GDPR is performance of a contract (Article 6(1)(b)) — you ask us to store your records, and we do so.

Cookies

MPG Calc uses the following types of cookies:

Strictly necessary cookies

  • Session cookie — keeps you logged in while you use the site. Expires at the end of your browser session.
  • CSRF token cookie — protects form submissions from cross-site request forgery. Expires at the end of your browser session.

Analytics cookies

MPG Calc uses Google Analytics 4 to understand how visitors use the site — for example, which pages are most popular and how people navigate between them. Google Analytics sets cookies (including _ga and _ga_*) to distinguish unique visitors and track sessions. The data collected is aggregated and anonymous — we cannot identify individual users from it. The lawful basis is legitimate interest (Article 6(1)(f)) in understanding site usage to improve the service. You can opt out by installing the Google Analytics Opt-out Browser Add-on.

Advertising cookies

MPG Calc displays advertisements served by Google AdSense. Google and its advertising partners may set cookies to serve ads based on your prior visits to this site or other websites. You can manage your preferences using the cookie consent tool displayed on the site, or opt out of personalised advertising at Google Ads Settings.

Some pages also display affiliate banners. If you click an affiliate link, you will be redirected via the affiliate network's servers (currently Awin), which may set their own tracking cookie to attribute any resulting sale. This cookie is set on the affiliate network's domain, not on mpgcalc.co.uk. See the Awin Privacy Policy for details.

For more information on Google advertising, see How Google uses information from sites that use its services.

Third parties

MPG Calc does not sell or share your personal data. The following third-party services are used to operate the site:

Data retention

Your data is kept for as long as your account is active. Accounts with no login activity for 365 days are automatically deleted, along with all associated vehicles and fuel records.

You can also delete your account at any time — see Your rights below.

Your rights

Under UK GDPR you have the right to:

  • Access your data — log in to see all your vehicles and records on the dashboard.
  • Export your data — download all your records as a CSV file from the dashboard.
  • Delete your data — use the "Delete Account" option in the dashboard to permanently remove your account and all associated data immediately.
  • Rectify your data — edit or delete individual records directly from the dashboard.
  • Withdraw consent — not applicable here, as the lawful basis is contract, not consent.

Contact

If you have any questions about this policy or wish to exercise your rights, please contact us.