Ive done a 300 mile day on one of my NSR MC21's. THat was with a TYGA seat pad (read thin hard foam pad). Of course it was 300 miles of all twisties, so there wasn't much time actually sitting on the seat for more then a 1/2 mile at a time.

Bring some oil with you, as the range of the oil tank will be found.
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Charles Gallant