The XT engine is a strange beast, big on torque and not so high on power, so your have to play with its strengths and flick gears or keep the momentum going. Ive seen 78mpg on my 06 XTR when fully loaded and did a non stop 70mph on the motorway with a 3 tooth lower rear sprocket (stg1 and 2 filter, CCC cans and kev mod) before this the best i had seen was around 70-75mpg.

It really does all depend on what way you drive and the conditions. I would first check with kev if your ECU is not one of the unlucky few which need changed under warrenty, then possibly fit a stg2 and kev mod, this should open up a bit more power but more importantly allow the engine to breath, which the XT range has a problem with. As its designed for off road a snorkle is fitted under the seat and its baiscally suffercating the engine from breathing proper and making the most of the fuel its burning

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Plough on