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Email Supportmichael@michaelgaff.com
Entirely on your device. Pit Stop has no account and no cloud — nothing you enter leaves your iPhone. (That also means deleting the app erases its data, and it can't be recovered.)
Make sure you allowed notifications when prompted. You can check under iPhone Settings → Notifications → Pit Stop. Reminders are scheduled on your device, so they work even offline.
Pit Stop uses the interval you set (in months and/or miles) and estimates mileage from your annual-miles figure. Update a vehicle's mileage anytime, and tap "Mark done" with your current mileage to keep projections accurate.
Yes — add as many vehicles as you like, each with its own reminders and history.