What Octane?

[Commo64]

What's the cost of reduced KM and poor running quality, for cheaper fuel? Asking for someone else's friend.

These engines were tuned for 91, so I personally don't see anything wrong with using 91... However, it's a good idea to occasionally put premium fuel...

 

[Immortality]

3.8 Ecotec or 3.6 Alloytec, Holdens claim in the owner handbooks both engines will run fine on 91 ULP.

Yes I'm aware of the different engines. I just didn't realise they made a VY crewman and then he also posted in the VZ section which at first glance would suggest the 3.6 alloytec.

 

[Fu Manchu]

Probably should be in the VY section.

 

[Aus78Formula]

These engines were tuned for 91, so I personally don't see anything wrong with using 91... However, it's a good idea to occasionally put premium fuel...

True, but the reasoning for it was off.

 

[Commo64]

True, but the reasoning for it was off.

How come?

 

[Immortality]

It would be nice if the OP would come back and clarify exactly what he has.