Use an 8-digit token for each car so it is easy to share.

README.md

@@ -12,7 +12,7 @@ The gear icon opens **Car**. A new install already has the server address filled
 
 **Sync on its own** sends a save right away and checks about every 30 seconds while the app is open. It stays quiet while the app is closed. **Sync now** sends every car on the phone.
 
-Each car has its own token, shown on the **Car** screen. **Share token** sends that string to another phone. On the other phone, paste it under **Add a car from a token**. That phone then syncs that car. A different car gets a different token.
+Each car has its own 8-digit token, shown on the **Car** screen. **Share token** sends those digits to another phone. On the other phone, paste it under **Add a car from a token**. That phone then syncs that car. A different car gets a different token.
 
 **Remove from this phone** takes the car off that phone only. The other phone and the server keep it.