Beware, the milage capable varies due to riding styles!
Ive done 30 miles after the light comes on several times on my r.
However I ran out not so long ago and ended up pushing it 2 miles to the garage after only doing 20 miles with the light on.
After i finished scratching my head i realised that most of that tankfulls miles had been done 2 up and going flat out everywhere.
Beware, pushing bikes aint fun!!!!!!!

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I'm always in the sh1t, only the depth varies