Well I just got back from the library.
The Ethos FR I tested today concerned me, and I did not even complete its test session.
I was TOLD by my citys small engine shop that the way MY mower was governed was by limiting airflow in some way. Today, I found out, they were wrong.
Turns out, my mower has a centrifically activated ignition cutoff. If my mower for some reason REVS too high, a switch gets thrown at anything higher than 3,454RPMS - a centrifical switch controls the ignition on my mower.
I say I WAS concerned, yes. I began testing Ethos tonight and the mower sounded good. Second run, good. Third run, bad (but not really) The RPM's of the mower were fluctuating. They would go higher than I've ever heard them, then they would fall, like it was sputtering and about to stall out....
I was ignorant. I didnt' know the additive had caused the mower such extreme RPM increase. I turned the mower off during the first five minutes of the third run with Ethos.
So yeah, the mowers RPMS increased ABOVE 3,454rpm and then it cut ignition. As RPMS fell, the centrifical switch clicked back and connected the ignition circuit to continue running.
I was pretty concerned there for a moment. I drained all the Ethos added fuel out and put it aside thinking it really messed up the mower. After walking back from the library, I now know better.
Anyway, I have some company so I will post the results thus far in a couple hours. But I do plan on finishing up with the Ethos. I still have enough for a fair third and forth run.