https://deltasdnd.blogspot.com/2021/12/wilderness-simulator-stats.html
https://github.com/danielrcollins1/WildernessEncounterSim
“One more reflection on the Original D&D wilderness encounter charts. Last week we were using some tabulated charts to decide between two possible rules interpretations, and one was clearly much nicer. But that was based on just looking at the average EHD (Equivalent Hit Dice) for each encounter type, which is maybe a little sketchy. Since I’m obsessive about these things, I wrote a simulator program that actually rolls up the individual encounters (varying the number appearing by psuedo-random dice), and I had it spit out a thousand random encounters for each terrain type.”
This all looks like pretty reasonable results to me!