peck420 peck420:
I have to say that my 'Volvo impresses me' metre just went up substantially.
Of all the cars I have driven (Ford, Chevy, Mazda, Subaru, Toyota, Nissan), I have never found one with a computer that can handle more then a couple octane points off factory...regardless of what they state.
Hell, I got to play with my brother-in-laws's Evo for a bit a couple weeks ago, and we couldn't get the computer to advance the timing (or boost) enough to make use of Petro's new premium around here, and that was using 94 AKI instead of 91 AKI.
I also upgraded my S80's ECU via the auspices of the fine folks at IPD in Oregon and that bumped the performance and mileage significantly. It's pricey but worth it if you plan on keeping the car long-term.