At some point Tesla decided that on local roads, that are not official highways, they would limit autopilot speed to the speed limit. I really didn't care about neighborhood roads as I drive at the speed limit, but on many county roads with speed limits of 55 or 60 mph, traffic usually moves at +5-8mph. Using autopilot is convenient because these tend to be many miles long, but it caused lots of unsafe overtakes by other drivers having to cross the dashed yellow line.
With the latest update as of August 1st, 2020, I was so pleased to see that speed limit for autopilot can be set to +-5mph. I usually have it set to +3mph relative speed...enough not to piss of drivers and also not too much to get pulled over.
Here are the update release notes. Small but useful features.
|Autopilot speed +5mph on local roads|