Can you tell me what tyre pressure you all use on a bog standard Brompton please?
On a 32mm Conti Urban about 90 psi. But as you know, track pumps may easily have a 5 psi error either way. Thus it may be 85 psi or 95 psi. I then leave it for weeks, and only add more air once noticeable soft. I think the max for the tyres is 100 psi.
As long as it’s not noticeably soft, and removes most of the road buzz, then you are golden. The sweet spot for tyre pressure, will be a range for you, and might differ from another person of even the same weight. Plus you’ll want lower pressures if you have rougher roads.