I was thinking the same thing. My bike should do that but I haven't got the tuning right yet so am a fair bit short. Best I've got out of a tank so far was the last one at 370km's off 30 litres. It only did 310km when i got it.
After filling up this week I discovered the choke cable had been dislocated and the chokes were half on. Hopefully that accounts for a fair bit of the lost economy.
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