i just did a trip hamburg-florence (3000km) and had my adeunis lorawan testdevice and my gps tracker with gsm tracking my trip.
it sended all the time with sf12 and 14dbm, average speed was 100km/h. Largest distance of my received signal during driving was more than 100km! Good located gateways could archive the typical 15km range. Very clear for me was the bad receiver of the adeunis device. (or the moving vehicle disturbed the rx signal too much…