Have you made the exhaust/airbox mods to your bike..?
650 TA's were strangled to meet the emissions regs and as a consequence use more fuel making their power.
The mods free up the engine and let it breathe as it should, which gives you more mpg.
I can't vouch for it personally-my 600 is pre-emission hassle-but an extra 10mpg seems likely from what I've read.
Definitely agree with the difference a heavy right hand makes. Two-up, fully loaded, caning it down the motorway into a headwind can get it down to the low forties, bimbling around the countryside I've had sixty
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Beware the dark, mechanical bird.
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