Again, you posted as I was typing the first bit of this post (my posts are often (one-finger) typed in stages whilst not multi-tasking) .
Prevention, well perhaps partial at least, is better than needing a cure, as I've put above try to have things as (reasonably) clean as possible to help keep things as (reasonably) clean as possible for as long as possible, this will also give you better performance which includes relative good fuel consumption.
(after seeing your post now).
Not sure why you have a VRS model but that's your business, I was going to put about V8s and fuel consumption but won't now given your concern with the Octavia's consumption. 😆
I'm with you on toll roads though I have used them, and been persuaded (told) to use them by my boss. 😉
Given the low speeds unless you need lugging power wouldn't a smaller more economical engine be better (don't you get the smaller and IMO better Japanese engines and cars there any more (or Chinese for the coal).
For the city the stop/start might be useful for fuel consumption and emissions and perhaps autobox and most of the other intrusive driver "aids", get the car's computers programs working for you as they'll have you working for them, particularly if you upset them (by letting the battery get too low, even if the car starts and the lights seem bright enough and there are no warning messages or light yet) the heat much above 20c can be literally draining on the battery.
For economy and spirited/"fast" driving, wear and tear on the car's parts, components and systems it's a lot about the driver's driving technique and style (I say this as a not particularly good driver). One of the best tuning aids for the car after or possibly before, full and proper servicing, maintenance and repair of the whole car is driver training and it can be transferred to other cars at no cost or loss. That goes that goes against the macho minds over here too. 😆
I used to see that some in Aus ran their tyres at higher pressures than we do here and what is recommended in the Owner's Manuals, and I've no idea of how they interpreted when the tyres were "cold" but tyres pressures can have an influence on fuel consumption as well of course carrying unnecessary weight, make them walk, 😁 tools, junk, or unnecessary items on the car that increase drag, having lots of electrical items running.
Having done a lot of the economical driving and mostly urban city driving you then need to give the car blow-out runs (and a bit more for VRS types), particularly if it's diesel or petrol with GPF negating at least some of the fuel consumption driving. I once done a 200+ mile (320+ km) drive with a 100 m section at 50mpg (5.65 l/100km) when testing engine and carbs set up and another section when my mate joined us at 25mpg (11.3 l/100km), first at well below legal motorway speed limit and second normal motorway speed, you can have it both ways but not at the same time. 🙂