Perhaps (I dont know nothing about flash) it could send a flash command to RR paly something loud. Or it could be part of the flash file when the values achieves some point then the pictures changes to a 'flame' and starts to play something. Just thinking..
Oh! I forget I prefer to see the consumption calculation as it is now (km/L) if you can implement those three options then will make everybody happy!
Tomorrow Ill check the ExtraOBD setting and post here.