The Bike - '04 Honda XL650V Transalp V4 90 day: 49.61 mpg (US)
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In the two years since I got it I average 45 MPG Imp.
I have changed the air filter to a foam piper cross and I have just replaced the front sprocket with a 16 tooth which is +1.
I intend to try each mod for a while to see the difference.