noob question, doesnt the B-series an K-series have knock sensors? If so, than it should auto adjust timing for the fuel id think so

i remember when my brother had his skyline, an used shell 100RON, really made a difference, power wise, on the dyno was run in at 194kw@100RON vs 184kw@98RON

Only reason i can really see ppl paying extra for 100 is if the car was tuned on 100RON or the vehicle was factory tuned on 100RON

If the car is getting more outta a tank means, its running leaner on a daily basis, so it might be a bad thing lol, id rather a car run richer than leaner, but i wouldnt know for sure, maybe it is getting more kms but not have any side effects