Does my mileage sync, and does it work on Android?

Mileage works on iOS and Android. Cars, fuels, prices, and trips sync between your devices with Device Sync, a Supporter feature, using the option you choose in Settings → Device Sync: Cloud Sync, which also syncs between iPhone and Android, or iCloud (Google Drive on Android). They're included in WitnessWork Backup (Settings → Account) and in backups from Settings → Backup & Restore on both platforms. Mileage is never shared with Buddies and doesn't appear on your calendar or Service Report.