i took this of ROY'S site
Most radar detectors have at least one city mode and highway mode. The idea is when you are driving in the city, switch the detector over to city mode to reduce the radar detectors sensitivity and reduce the chances of all the false alerts. Then when you are on the highway, switch the detector over to Highway mode to increase the sensitivity detecting Smokey at a greater distance away and allowing you ample time to slow down.
As you can imagine, many people forget to switch from mode to mode as their driving environment changes. Auto Mode to the rescue! This feature adds a third sensitivity range to your radar detector which allows it to sample your driving conditions and adjust the radar detector accordingly. Available only with the Escort 8500 X50 and the Beltronics RX65.
Is he talking about autoscan? Does this mean that when in Autoscan the detector is somehow monitoring your driving conditions? Does it know your speed or something (like the 9500i, I know it has GPS and is dif just using an example)?