Yaris vibration abnormality

[talhahs]

Thanks a lot YarisSedan, I shall move back to 91 once I dry up my fuel tank to last bar. Its only been a week on 95, I hope it has not destroyed my engine yet. I will need a refuel hopefully this week. I will not want to go for thorough cleanup as you said earlier (unnecessary costs!)..Any suggestions?

Secondly, about the engine mount problem? How crucial is that and what are its symptoms? How can I get my car to proof that it has engine mount problem?