[rdubz]

Maybe I need to caveat it more, but I'm really focused on the range from, say, ≈5mph (uphill on a "leg-bike", or starting from a stop at a light or stop sign) to ≈25mph (roughly my top speed on a leg-bike or e-bike).

In that range, and in mixed traffic (which is unfortunately most urban riding in the US), a 5mph difference can be a step change in terms of whether drivers even feel the need to pass me at all. 15mph is only 50% faster than 10mph, but can totally flip the "who's passing who" dynamic from "cars passing me frequently+aggressively" to "cars hesitate, back off, and then I get ahead / pass the next cars in line at the next light."

Here's an account where I've been posting videos that illustrate this a little more viscerally: https://twitter.com/CarsDontFitJC/status/1457490588320817153