When I was commuting on the bike I got roughly 10-15 mi/gal over the OP in less than ideal weather conditions. Like others, I'm inclined to say the primary problem is a tuning issue that can be corrected, rider error, or both.
It's exciting to see you handle this systematically Khan. Particularly interested in the change of shift point.
Don't discount the carbs though, they can be finicky at times.
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