Also new car radios seem to use SDR for FM reception and simply downconvert whole FM band to 20MHz wide IF and sample that with ADC and then do all the FM demod

Also new car radios seem to use SDR for FM reception and simply downconvert whole FM band to 20MHz wide IF and sample that with ADC and then do all the FM demodulation in software. This causes the radio to simply known all stations that are available and have RDS metadata (on VW's radios pressing the scroll knob in the radio screen gets you menu of visible stations that is shown essentially instantly) and to be able to do such handoff without any scanning essentially instantly. The handoff is so fast that it gets very annoying when the transmitters involved have different delay (at least in Europe radio stations tend to compensate for this by introducing delays on their end so the whole network is synchronized) or when it happens in middle of advertisement (which are usually different for each transmitter). When either of these annoying effects happen you can hear that the radio is perfectly willing and capable of switching the transmitter several times per second.