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Ever hear an 850 knock? Running regular gas, 87 octane around here and 85 in the mountain states, will cause retarded timing and extra gas to be used. The 2 knock sensors prevent detonation better than human hearing.
Trying to get more than 4K rpm on regular gasoline at full throttle will not work. On a turbo engine, it will stop at around 5K on 89octane.
Using regular gasoline will not hurt the engine, just the check book because of the mileage decrease.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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