My MY05 WRX (with a 98 octane only sticker) was serviced yesterday at Osborne Park Subaru. As I walked in to drop the keys of, the person at the service desk was talking on the phone to a MY06 STI owner. Told him its ok to run on 95 so long as you dont hit full throttle or rev out etc etc.

After he hung up, he told me (after questioning him) that even though my car says "98 octane only" its ok to run 95 for the short term without gunning it. he said, the 98 only is more a guideline to be safe. Also, that using 95 or even 91 will *not* void the warranty and the car can handle it in the short term. Obviously, driving for 2 years like that is bad - hence the sticker.

Also said not to add any octane boosters etc

I drove to 5 service stations and then phoned 3 before I found some U98 at Sorrento BP (on Sunday). Filled up a couple of jerrys also.