After all this info, I am still none the wiser (probably because I am no techno-wizard!). But is it possible to get the engine re-mapped (by Official alfa dealer?) for the fuel with higher octaine rating, and if so, what is considered the best Air Filter to further improve performance? Also, aftermarket engine re-maps by tuning houses.....what chip have you boys/girls found worked best (was there a discernable difference?)?
My personaly experienc, is that after using 97 (changing from previous 95) is that the idle/tickover is rougher, but that fuel consumption has improved by +-10%. I now average about 10.8 - 11.2 (l/100k). Wheras previously with 95, I would average 12.8l/100k (and sometimes even 13l/100k!). I have spoken to my alfa dealership, and he stated that they could not set the ECU for the increased octane rating. But they'r useless, so if anyone has found different pls let me know!