I pumped Petron RON100 on the 1JZ when it was fresh out from the garage, at least for few weeks. Once i switched over to RON95, i found out it slows the response a little, but still would not slow the car down drastically.
For Lancer, it runs better on RON100 too especially higher RPM. On RON95, it still quite eager to go, suffers abit loss at low end.
For Volvo S60 T4, same case as 1JZ, but low rev is abit noisy.
What to do, my free petrol is only available for Shell. Not planning to spend so much money on Petrol when i have 3 cars to hoon.