Thx for the feedback. Wrt to 19T to 18T switch affecting mpg, there is a caveat that occurred to me after adding that part of the page - it's not an apples to apples comparison. From what I understand the speedo AND odometer pickup is such that switching to the 18T will have thrown off the accuracy of the odometer. All the data is based on the bike odometer, not a GPS - so I guess the miles covered between fill-ups is now actually slightly less than indicated - but by how much I've never tried to figure out. To your point I know I used to slip the clutch more in heavy traffic (especially when carrying a pillion) with the higher gearing, and in the tighter switchbacks I'd drop to first whereas now I can leave it in second for all but the tightest stuff. What all that adds up to in my mind is economy is not a deciding factor in the switch, as any change is barely measurable, but drivability is definitely improved. Like the exhaust it could inversely affect mpg just by virtue of the instant gratification twisting the throttle gives

The only reason I'd switch back to 19T is for a very long freeway run, but that's not going to be happening.
As for the asymmetric staining, well I'd like to keep this thread alive so not sure I want to go there

- would you believe I finally cleaned them a couple of weeks ago when doing the oil change, so they are all equally clean now. Maybe in a few weeks I'll have a sample to post...