Done also last weekend for 1'600 km - but just in the non-cruising curving parts of my longer trip. For beeing really comfortable i prefer arount 3'500 to 4'000 rpm's.

But on the highway in Germany i had for longer time also 5'000 rpm's at 130 km/h real or 140 km/h on the instruments.

Don't worry about it - if it's comfortable for you - the XT will take it easily .

regards from Switzerland,

Andy