Do you do many short trips? That is one of the main reasons for high fuel consumption because a cold engine runs very rich. City driving is also way less efficient than highway driving

M cars are always better. Look at how good the M3 looks and always think about RWD and LSD combination!!! Its godly and will make you so much happier than 0,2 sec faster 0-60

I drive a alpina and they modified it to 400hp and its literally perfect power for this engine. 110k miles ans still going strong. Had the injectors fail at 85k miles but no other issues yet