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What's new

Changes to the site, newest first. Spotted a mistake? Email [email protected].

8 November 2026

  • New guides on reading tire sizes, wheel offset, bigger tires, plus sizing, MPG units and real-world fuel economy. Read the guides.
  • Every vehicle page now links to the same model in our other data: US EPA figures, UK VCA figures and factory tire sizes.

2 November 2026

  • Corrected model names that had been shortened in the official data (for example Bentley Flying Spur, Chrysler PT Cruiser and Grand Voyager, Jaguar S-Type and X-Type). Old addresses redirect to the new pages.
  • US electric-car pages now show MPGe and range in their summary.

28 October 2026

  • Fixed UK model groupings such as the Toyota RAV4 and Chevrolet Corvette.

22 October 2026

  • Site launched with 11 calculators, tire size pages and vehicle pages built from Swiss, US and UK official data.

Data sources: last downloaded