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I guess I find a lower cadence more comfortable, on roadie and fixed, maybe 80-85ish, but can spin when I have to.
I've run that gearing on my fixed for about 3500 miles and it's been fine. Kneecaps haven't popped off yet :)
Looking at my last few commutes, strava gives an average of about 16/17mph but generally I tend to hold 20mph upwards when moving and I don't find pulling away too bad.
I wouldn't do it brakeless, and I don't rely on leg braking to slow me down.
~85" for around town? Knees dude. Knees!
You may be able to turn it, but it doesn't mean that a much lower gear wouldn't be a better choice.
Starting and stopping are two things that would be much easier: getting the jump at the lights is safer than grinding away in the queue and your knees will thank you when you have to halt.
You'd have greater bike control not straining to get on top of the gear and I'd also put money on your average speed increasing.
Is your cadence even in double figures? "Spin To Win" yo!