^^^ Ed, '---' is live consumption, if you kept it in the average calc screen the mpg would probably increase.
Re coasting... Proper Coasting is no throttle IN GEAR. Neutral uses fuel to keep idling, so run down the gearbox in gear to maximise mpg...
In terms of economy, I'm pleased if I get into the 30's.
My All-time high is 41.7 on a motorway, how people can achieve over 50 I don't know, but to be honest, how can you be having any GTi-esque fun whilst trying to achieve 50+ mpg..?