[draugadrotten]

> ...the distance between 20mph and 30mph on the dial is 1-2mm, so tiny that it's really hard to stay in that spot right between them to follow a 25mph limit

You are doing it wrong. You do not need to stay "in that spot" - you only need to ensure you are not speeding. For most drivers, this is not hard, and if you are not able to do it, perhaps you should not be driving.

[gambiting]

I especially like how you skipped past the entire point of my post - that speed limits ending in 5 make little sense, and that's the point I wanted to discuss. Whether I can stay below the limit or not was neither mentioned, nor has any impact on this discussion.