is it ok to shift from 95 octane to 91 octane? as my car is suitable to use 91 octane only..but because of ignorance we use 95 octane from the start until now.my car is a 2003 mitsubishi lancer 1.3.. Thanks
It's absolutely fine to use 91.
If Mitsubishi say the engine's designed to run on 91 octane then it's fine to put that in it. Using 95 octane will only harm your wallet as it's usually more expensive than 91 octane, it won't have any effect on the engine.