Support

Help with setup, the adapter and sending us a drive.

What you need

• An iPhone with iOS 18 or later.
• A car with an OBD-II port. Most cars and light trucks from 1996 on have one, under the dashboard near the steering column.
• For the best results, a Bluetooth OBD adapter (see below). Without one, Gas Math works with the iPhone alone, but its estimates are rougher.

The adapter

Gas Math is built and tested with the Veepeak OBDCheck BLE. Other Bluetooth LE adapters based on the ELM327 may work, but we haven't tested them. Classic Bluetooth and Wi-Fi adapters won't work with Gas Math.

1. Plug the adapter into the OBD port.
2. Turn the key on, or start the engine.
3. In Gas Math, tap Start driving. The app finds the adapter and remembers it. Don't pair it in iPhone Bluetooth settings.

After that, with Start automatically on in Settings, a drive starts when you start the car.

If something's wrong

• Can't find the adapter: check that Bluetooth is on and Gas Math is allowed to use it (iPhone Settings › Gas Math). Unplug the adapter for ten seconds, plug it back in, and try again.
• "Turn the key on": the adapter is connected but the car isn't answering. Turn the ignition on.
• Fuel figures look off: log a few fill-ups. Gas Math calibrates its estimates to your real fill-ups.
• No sound: check Sound cues in Settings and your phone's volume.

Please set up the app before you drive. Gas Math is built so you never need to look at or touch the phone while moving.

Send us a drive's log files

If a drive looks wrong, its log files help us find out why.

1. On the Home screen, long-press the drive.
2. Tap Share log files.
3. Send them by email or another app, with a line about what went wrong.

The log files include the drive's GPS route. See the privacy policy for what's in them and how we treat them.

Contact

support@gasmath.ing

Gas Math is made by one person, so replies can take a few days.