Sorry budget. I'm just not getting how this can help you unless you specify and compare other characteristics of the individual Broncos. The only thing that will remain consistently comparable is engine rpm.
Then again... I'm probably overthinking it and you're just curious what others do?
Do you have a tach?
If still going for MPH only, and looking for recommendations on how to drive yours, I'm not sure you should say "regardless of gearing and tire size" for your question. Since that's exactly what dictates the MPH at whatever rpm someone likes to shift at. And add the different manual transmissions in use today, and you have even more variables.
Otherwise it makes no sense, since whatever we tell you means nothing unless you have the same gearing and transmission and tire size. As well as weight of the vehicle, modifications to suspension and overall ride height, etc.
To that we can add engine modifications of course.
A stock 3speed first gear with 4.56 diffs and 28" tires is going to shift at 8 mph or so. The same guy with 3.50's and 35's is going to be speeding along at 20 or more when he shifts out of first.
So better tell those answering with speeds to add that info to their responses.
At least for me, I use rpm (sound, feel, tachometer) and not speed, to get shift points on any drive.
So in my case I'm not going to be any help (sorry again
). 'Cause whether around town in traffic, or off-road in the rocky terrain I frequented, it varied every shift practically! Sometimes I stayed in 4-wheel low for three days on the trail without ever shifting out of first!
But for RPM, I generally liked shifting at 2500-3000 rpm most of the time.
What speed that is going to be for you would only work if you have the same 4.11 gears and 32" tires I had. And whether it works for you or not might depend on if you have a stock engine or modified, stock chassis or modified, or are carrying a load or empty.
Sorry I can't remember what speeds those rpm levels equated to exactly. Too much variation.
Then again, maybe I can half-guess just to give a starting point.
Good luck getting any consensus or reasonable recommendations though, unless everyone specifies what gear ratio, tire size and transmission they're running.
It's what you want and feel comfortable with. These things are kind of road-pigs anyway. If you've got the stock 3-speed manual gearbox, all the ratios are wrong almost all the time for what's needed.
I would rev it to 4-grand trying to get into traffic, or 2500 cruising along.
And when in low-range? I couldn't tell you if I've ever even looked at the speedometer when in low! After all, in low you're always on a trail of some kind. Never on the street unless in very special circumstances.
Anyway, I'm the one over-thinking it here. Maybe all you want is to see what others do, rather than are looking for what you should be doing. With all the people here, there's bound to be a few that watch their speedos all the time.
So I'll play after all.
Driving isn't as simple as it used to be around here, but even in the good old days of less traffic, I probably shifted:
From first to second at anywhere from 10mph to 20mph.
From second to third I probably shifted anywhere from 25mph to 45mph.
In low range? No data. Never looked.
Good luck.
Paul