Best mileage figures I can give is based on not cruising the highway over 110kph, as blind Freddy knows when you open a rocket up you can't be concerned about fuel economy.
Best 17.8kml that's about 5.6 litres per 100km (428km per tank) - Average 14.5kml that's about 7litres per 100km (342km per tank)- Worst 183kms to 24litres, gotta say loved the ride, full throttle and don't back off until your empty