That's cool. Getting great mileage...err kilometer-age (lol) out of the ol'mule. I see there is hope for mule longevity. As much as it seems like I ride mine, I don't think I'll live long enough to reach the km's you have. I've had mine for coming on 6 years and I just past 3,000 miles late summer. Of course I don't ride much pavement with it.
Still, glad to see the TW will last a long long time if taken care of.