Downside(s) of using 87 octane rather than 91?

Can someone explain clearly what the disadvantage(s) is/are for using 87
octane rather than 91 octane in an S60? Is octane a more important
consideration if you have a turbo? More important for HPT than LPT?

 

Because the engine will retard the timing with 87 ocatane, reducing power,
and possibly increasing fuel consumption. If you can afford a S60, you can
afford the premium fuel.... It's not like they are bad on gas.

And no, its not because in Europe they use 95 octane, their fuel ratings are
calculated differenly, we just have higher sulphur I believe.

 

Performance and mileage suffer using 87 octane. The car will run, but not as
well.

The difference in performance is significant - the improvement in mileage
makes the price difference not so great....!

PC

| Can someone explain clearly what the disadvantage(s) is/are for using 87
| octane rather than 91 octane in an S60? Is octane a more important
| consideration if you have a turbo? More important for HPT than LPT?
|
|

 

You MAY also get an increase in carbon build up. Running one in three is
often recommended as is giving your motor a decent hard run from time to
time.




AJS