Mini cooper s f56 petrol buyer advice

[Nomad Rider]

Hi everybody, my name is Benjamin and I'm new to this forum.
I'm looking to buy a new daily/fun car and the mini cooper s f56 2.0 163cv petrol tick all my requirements,not too powerful from factory so i don't pay too much taxes here in Belgium but with remap potential,fun to drive and most importantly it need to be reliable because i do 22,500 km/year(mainly highway) and my old opel astra j 1,7 cdti gave me a huge amount of troubles so hopefully my next car will be better.
I did looked for info but didn't finded too many about his reliability, if I'm right it has the bmw 2.0L b48 engine wich can be remaped to 250cv +/- so I'm concerned about the engine and overall car reliability and I'm also a bit concerned about fuel efficiency due to the amount of kms i do.
I know that for that amount of kms i should choose a diesel but i was hoping a small petrol car would do the job since I'm bored to drive boring cars and the driving experience is very important for me.

Thanks in advice and i hope this isn't a duplicated post
Great day too every bimmer!