67mpg out of a 500cc is not unheard of, especially with gearing mods.
Galahs has a 17/45 gear setup, for a 2.67 final drive.
I'm running a 15/39 setup on my ninja 250, for a 2.6 final drive, with a 101.5mpg best tank.
I suspect Galahs can lower his final drive down to around 2.5 and still ride just fine. He would have to change the rear gear to a 42 or 43 tooth.
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