OK. I think there is something funny going on - at least when Banishing is taken into account.
I'm in Axecore, post-NS, pre-King, leveling to L30. I decided that the no-brainer way to do this - up to some level, at least - is in the Gallery.
I have the following effects up:
Song of Solitude (-20%)
Sonata of Sneakiness (-5%)
Ring of Conflict (-5%)
Ballroom Song (-5%)
KolMafia tells me I am at -35%.
I banished the rusty suit of armor
I banished the guy with the pitchfork and his wife
Every time I see the Garden, I banish it for 10 turns with option #4, at no turn-cost
In 994 turns, I saw the following:
433 Louvre
81 Garden (no turns consumed)
561 cubist bull
I encountered the Louvre 433/994 = 43.6% of the time and the cubist bull 56.4% of the time.
Or is it really (433 + 81)/1075 = 47.8% non-combats?
What is my real non-combat rate?
FWIW, I'm getting about 35 Muscle substats per bull and 330 per Louvre, for an average of about 163 per turn. That's not TOO shabby for something which requires absolutely no thinking or item purchases. I'll hit L30 in about 8 days, just doing this unless I decide to switch to the scaling monsters on the moons at some point and/or start using divine noisemakers and such to get a little extra boost...