Not being descended form The Princess Who Could Not Abide the Pea, as some BF members seem to be, I freely admit that if someone altered my FG with a different sized chairing and cog that produced my favored 70 GI I could not tell the difference at all on my usual routes. Oddly enough, and perhaps even more astonishing, if the pressure in my tires were altered up or down by a couple of PSI, the chain was dried or given a drop or two of lube, my favorite socks were donned inside-out and an extra tire lever snuck into my flats kit I'd be oblivious to all of that as well on a rolling 20 mile ride.
Sometimes one just get on with riding the bike despite lacking the finest discrimination of the subtle minutia that creeping 41-ism provides, along with genetic Pea/Mattress Anaphylaxis of course.
-Bandera