Can anyone please give me a definitive answer here ….. very conscious of keeping to speed limits on UK motorways, especially those dreaded 50mph average speed cameras, but while my speedo states I am going say 50mph, my satnav states a speed of 44mph or thereabouts. Agreed, I am probably well within the law but do car speedos vary from car to car in accuracy? And just how accurate is the satnav speed indication? Cheers ………
