My adblue light has several times in the past come on randomly advising 650 miles left but I know it had enough for many more miles and after ignoring it for a couple of hundred miles it would revert to expected reading. Yesterday before leaving London I filled with 2.5 gallons as requested by true reading. It only gave me 300 extra miles driving. I am now approaching Glasgow and it shows 500 miles left on adblue - it has never taken this long to reset. I have 220 miles to go to Skye and feel like I’m playing chicken with the EMS. Has anyone had an incorrect reading shut down the engine please? Or have incorrect readings all resolved before shutdown. I would be grateful if you would let me know.