Terms of use
Effective November 12, 2026
Gas Math is a driving coach. It is not a safety system, a diagnostic tool, or a tax adviser. By using it, you accept the following.
You drive; it coaches
Mount your phone before you set off, and leave it alone while moving. Obey the laws on phone use wherever you drive. Gas Math is designed so that you never need to look at it or touch it in motion; please take it at its word.
Brake as hard as you need to
The smooth score rewards planning ahead, not braking less. Never let a score, a sound, or a streak stand between you and a stop you need to make.
Figures are estimates
Fuel, cost, CO₂, savings, and distances are calculated from engine and phone data, and from published vehicle figures. They can be wrong, sometimes by a lot, until your fill-ups calibrate them. Please don't base decisions that matter on them alone.
Engine codes and warnings are for information
Gas Math reads trouble codes and explains the common ones, and it can warn about coolant temperature and battery voltage. A code's meaning and seriousness vary by car, and the absence of a warning is not a clean bill of health. Keep an eye on your dashboard and, when in doubt, see a mechanic.
Gas Math never clears codes or changes anything in your car.
Adapters are yours
Gas Math works with third-party OBD-II adapters, which it neither makes nor sells. Some adapters draw power while the car is off, and some cheap ones misbehave with certain cars. Fit the adapter where it can't catch your knee or the pedals, and unplug it if the car will sit for a long time.
Your records are yours
The mileage log is a convenience. Please check it before you rely on it for taxes or expenses; your records remain your responsibility.
Your data
See the privacy policy. In short: no data collected, and your drives stay on your phone.
No warranty
Gas Math is provided as is. To the extent the law allows, Peter Wills isn't liable for any loss or damage arising from its use, including to vehicles, phones, or adapters, or from relying on its figures.
Apple's Standard Licensed Application End User License Agreement also applies.
Contact
Questions: support@gasmath.ing