I have seen the report of 1500s running TCW3 oil too and it is believable in a carbureted engine but I have tried it in 2 1800s and do it occasionally when I think about it and it does seem to make it run smoother but it has never made any difference in fuel economy, neither has running pure gas.
I don't know if it will or not, but on one trip a while back, I tried to find Pure Gas and the first thing you notice real fast, is the exhoribant price hike they charge for it.
The 2nd thing I noticed, was the mpg increase logged by Fuelio was not near enough to offset the cost difference.
When I filled it up with Pure Gas this last time, a few days ago, I was just thinking about the trip to ES coming up and wanted the tank to be full before I left, and was wanting to see if a slower ride like I have planned this time, will make any noticeable difference in MPG on my bike.
If it don't pan out good enough, I will forget about trying to find Pure Gas... and the cost of TWC3 added to the premium costs of pure gas really makes it not worthwhile.
when I did that, I was not planning on pulling my trailer, then two days ago, I decided that I can't afford not to... being away from home, I need all of my support gear in case I get too hot, and need something.