I’ve been driving a Golf for the past couple of days. 1.5 litre petrol engine, seven speed DSG with fairly high gearing and an engine which spends a surprising amount of its time stopped. Go down a modest slope and it’ll stop. Slow down in traffic and it’ll do the same (although strangely it’ll often start as soon as you come to a halt). Despite all that, this is claimed to be the average fuel consumption (don’t like l/100 km? Google is your friend). The petrol engine is a problem of course but even so it’s far from impressive.