when are these bikes actually out of gas??

[Pterodactyl_imp]

Mate, Undecider has come up with the definitive answer and Kmoney is also on the right track. It's not how much petrol you've got left rather it's how far you can go before a sudden silence. And that depends on how you ride it. Touring I might get another 50kms from last bar flashing. City riding, or being heavy handed, I might get another 30kms. If you really want to know strap a can of gas to the bike and go for a ride.

Cheers