I have had my 2020 model 1.0L petrol A3 (30 TFSI) for 11 months. It is manual transmission as I prefer to be in control. My usual run is semi-rural (Wallingford to Didcot 7 miles away, Wallingford to Reading 12 miles away or Reading to London Paddington station - if there isn't a train to get me home at night - 52 miles away).
Using E5 fuel, I regularly get over 50 mpg driving at road speeds without being "Captain Slow". However, right back from my army days in he Royal Corps of Transport, I was taught to drive well in my instructor expecting me to "make good progress but anticipate events up ahead early" avoiding unnecessary braking - I have had it up to 60 mpg. Running on E10 fuel, the mpg drops considerably - anything between 42 mpg and 48 mpg but I cannot, for the love of all things mechanical, get it up to 50 mpg.
As soon as I fill up with E5 fuel again, back up goes my mpg so I refute the government scientists' and the petrol companies' that you hardly notice any difference in consumption! You damned well do!
You use a bit more fuel if you have an automatic gearbox, if you use the cruise control or speed limiter or if you use the air con (and you should use it at least once a week, even in winter, to keep the system fresh and in good order).
My car goes in for service in a coupe of weeks ad there is an "Engine Management System Software Update" due, according to the My Audi App, so I hope that doesn't affect either performance or fuel economy adversely as I love my car as she is even if she is boring, plain white!