Hello Granit,
Please excuse me if I’ve got this all wrong, but it looks to me that you are focussing on your discontents with the car ( possibly compared with the old one) rather than enjoying what is better with it. It don’t wish to be critical, but things like fuel consumption are now rather more what-you-have-is-what-you’ve- got, and it would seem that your car is about typical, give or take road conditions and driving style, so is it really worth worrying about too much in the overall expenditure to buy the car?
I’m sure you will appreciate that road noise from tyres can vary considerably, and yes, there could be something wrong with the car, but chances are there isn’t. Not sure what changing brake discs was likely to do to alter this, but OK..
I think it might be worth trying to sit back and enjoy the car Granit, but if you can’t then this could cost in terms of exchanging it for something more suitable.
Tyre makes and remaining tread? Is your car a Sportback?
Kind regards,
Gareth.