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I have a 96 volvo 850 wagon with 195k miles on the odometer. The owner's manual calls for at least 91 octane. I run it on 87 octane almost exclusively after testing every octane I could find repeatedly over multiple fill ups. There is no difference in power and a slight improvement in fuel economy with 87 octane. If you 95 volvo stalls on 87 octane, there is something else wrong with your car. Probably the thermostatic intake mechanism.
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