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The next thing to check is the lubrication systems for wheels, drive train, and engine. The bearing grease could be upgraded to include moly disulfide as in CV joint grease. The gear oil could be multi grade. The engine oil could be a 0w-30 synthetic. Some folks have claim a non O-ring is more efficient.
The bolt on mods are usually a gear change and aero improvements. A touring fairing and a good size cargo bag on the seat help. Anything to lower the shoulder height by angling the back forward or backwards from vertical will reduce frontal area.
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